For a long time, many psychologists embraced a victim narrative about trauma, believing that severe stress causes long-lasting and perhaps irreparable damage to one's psyche and health. In 1980, post-traumatic stress disorder (PTSD) was added to the list of mental disorders and has since received a lot of attention in the media and among ordinary individuals trying to understand what happens to people in the wake of tragic life events. Yet psychologists now know that only a small percentage of people develop the full-blown disorder while, on average, anywhere from one half to two-thirds of trauma survivors exhibit what's known as post-traumatic growth. After a crisis, most people acquire a newfound sense of purpose, develop deeper relationships, have a greater appreciation of life, and report other benefits.

       In American culture, when people are feeling depressed or anxious, they are often advised to do what makes them happy； they are encouraged to distract themselves from bad news and difficult feelings, to limit their time on social media and to exercise. However, the happy feelings one gets by doing pleasant things fade fast, and soon the sad mood takes over, plunging one into a deeper abyss of melancholy. A better strategy to cope with trauma has to do with meaning-seeking. When people search for meaning, they often do not feel happy, because the things that make our lives meaningful, like volunteering or working, are stressful and require effort. But months later, the meaning seekers not only reported fewer negative moods but also felt more enriched, inspired and part of something greater than themselves. Therefore, although none of us can avoid suffering, we can still learn to suffer well.

       Have you ever lost a bag when you travel? You are not alone. Many people have lost bags, especially when they fly. Airlines__41__delivering passengers’ bags, but sometimes they lose them.It’s lucky if they can find your lost bags. However, some bags are never returned to their owners. When bags go__42__for 100 days, airlines will sell them at auction.

       When you are buying these bags, prepare for surprises, because you can’t see__43__is inside.There may be valuable items in them, but it’s very likely that you’ll __44__ with ordinary things. Today, these bags are getting less common,__45__airlines have better technology to find their owners.

       Although letters of credit first existed only as paper documents, they were regularly issued by telegraph in the late 19th century, and by telex in the __24__ half of the 20th century. Beginning in 1973 with the creation of SWIFT, banks began to migrate to electronic data interchange as a __25__ of controlling costs, and in 1983 the UCP was amended to allow “teletransmission” of letters of credit. By the 21st century, the vast majority of LCs were issued in electronic form and entirely “paperless” LCs were becoming more common.

       Ocean waves represent our planet’s last untapped large-scale renewable energy resource. Over 70 % of the earth’s surface is covered with water. The energy contained within waves has the potential to produce up to 80,000 TWh (10¹² watt-hours) of electricity per year—sufficient to meet our global energy demand five times over.

       No wonder the idea of extracting energy from ocean waves and turning it into electricity is an alluring one. The first serious attempt to do so dates back to 1974, when Stephen Salter of Edinburgh University came up with the idea of “ducks”: house-sized buoys tethered to the sea floor that would convert the swell into rotational motion to drive generators. It failed, as have many subsequent efforts to perform the trick. But the idea of wave power will not go away, and the latest attempt—the brainchild of researchers at Oscilla Power, a firm based in Seattle—is trying to address head-on the reason why previous efforts have foundered.

       This reason, according to Rahul Shendure, the firm’s boss, is that those efforts took technologies developed for landlubbers (often as components of wind turbines) and tried to modify them for marine use. The consequence was kit too complicated and sensitive for the rough-and-tumble of life on the ocean waves, and also too vulnerable to corrosion. Better, he reckons, to start from scratch.

       Instead of generators with lots of moving parts, Oscilla is developing ones that barely move at all. These employ a little-explored phenomenon called magnetostriction, in which ferromagnetic materials (things like iron, which can be magnetized strongly) change their shape slightly in the presence of a magnetic field. Like many physical processes, this also works in reverse. Apply stresses or strains to such a material and its magnetic characteristics alter. Do this in the presence of permanent magnets and a coil of wire, such as are found in conventional generators, and it will generate electricity.