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(A)It's a distance that is so minute that comparing it to anything in the regular world is a bit of a joke.
(B)Nanotechnology matters because familiar materials begin to develop odd properties when they're nanosize.
(C)Nanotechnology has been around for two decades, but the first wave of applications is only now beginning to break.
(D)Not all nanosize materials change properties so usefully, but the fact that some do is a boon.

A tsunami is unnoticeable in the open ocean－a long, low wave whose power becomes clear only when it reaches shore and breaks. (D)Technological revolutions travel with the same stealth.海嘯在海洋中是不會被注意到的－他只是個長且平緩的浪，只有在觸及了岸邊或是防波堤時，人們才能夠看清楚它的威力與樣貌。(D)科技革命也有異曲同工之處。

Spotting the wave while it's still crossing the ocean is tricky, which explains why so few of us are aware of the one that's approaching. (C)Nanotechnology has been around for two decades, but the first wave of applications is only now beginning to break. 能夠在浪還在海中時，就發現它的存在是一件很不容易的事，這也解釋了為什麼只有少部分的人能夠察覺到浪正在朝著我們前進而來。(C)奈米技術已經在存在於人類生活中足足有20幾年之久，但它所帶來的浪潮(衝擊)也才剛開始而已。

As it does, it will make the computer revolution look like small change. It will affect everything from the batteries we use to the pants we wear to the way we treat cancer. The main thing to know about nanotechnology is that it's small. Really small. Nano, a prefix that means "dwarf" in Greek, is shorthand for nanometer, one-billionth of a meter. (A)It's a distance that is so minute that comparing it to anything in the regular world is a bit of a joke. 如同我們所知道的，奈米技術使得計算機革命看起來只是些小改變。它的影響層面無所不在，像是我們所穿的褲子，更甚至於至我們如何去對抗癌症。我們對於奈米技術的最主要認知就是它很微小。真的很微小。Nano在希臘文中是"小"的意思，是奈米(nanometer)縮寫，等於0.000.000.001。(A)它微小到如果與這世上的一般事物去比較筆來根本是個笑話得微不足道。

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39題答案原本B，更正答A給分!
This comma, for instance, spans about half a million nanometers. To put it another way, a nanometer is the amount a man's beard grows in the time it takes him to lift a razor to his face. (A)Nanotechnology matters because familiar materials begin to develop odd properties when they're nanosize. 拿這個逗號來說，它等於是半個百萬奈米。用另種方式來說，一奈米等於是一個男人拿起刮鬍刀到他臉上刮鬍子的時間。(A)奈米技術之所以重要，是因為他所含有的相似物質，會在奈米化的同時出現一些奇特的屬性。

Tear a piece of aluminum foil into tiny strips, and it will still behave like aluminum－even after the strips have become so small that you need a microscope to see them. But keep chopping them smaller, and at some point－20 to 30 nanometers, in this case－ the pieces can explode. (D)Not all nanosize materials can change properties so usefully, but the fact that some do is a boon. 將鋁箔紙撕成細細的條狀，他則會像是鋁的樣子－就算這些被撕成一條條的鋁箔紙已經細到必須用顯微鏡才能看得清楚也是。在持續著將他們切成小塊狀，約20-30奈米－這些小碎塊就會爆裂了。(D)並不是所有的奈米物質的屬性都可以被改變成如此有用的東西，但可確認的事實是有些部分就是有用的。

With them, scientists can engineer a cornucopia of exotic new materials, such as plastic that conducts electricity and coatings that prevent iron from rusting. 而有了這些細小的碎塊，科學家就能夠使用/變造這些大量的新物質，變成像是帶電的塑膠，和防止鐵生鏽的鍍膜這些。