A.(動物的)棲息地; (植物的)產地[C] I prefer to see animals in their natural habitat, rather than in zoos. 我喜歡看生活在自然棲息地的動物而非動物園內的動物。 B.常去的休閒度假之處; 名勝[C]There are many summer resorts in the mountains. 在山裡有許多避暑勝地。 C.趨勢, 傾向, 潮流[C] The military government failed to control the current of public opinion. 軍人政府未能控制輿論的動向。 D.循環, 環流; 運行[U][S1] We observed the circulation of blood in frogs. 我們觀察了青蛙的血液循環。