例句與造句

1. wastes resulting from man's activities have been traditionally discharged into the ocean .
   人類活動時所產(chǎn)生的廢物傳統(tǒng)上都是排入海洋。
2. the study of "heavenly bodies" was only a very small part of man's activities in those distant days .
   遠古時代人類對于“天體”的研究還只是其活動的一個很小部分。
3. It's difficult to find man's activity in a sentence. 用man's activity造句挺難的