在学习英语词汇中，有时同义词的辨析是很不容易的，我们一般从三方面进行区分，即：语法、语义和文体。语法主要是词性、搭配、句式等的区分；语义主要是词义的本义、引申义、比喻义和内涵和外延等的区分；文体主要是正式和非正式、褒义和贬义等的区分。

　　9.旋转 turn: The most general one.

　　(自转) spin: To turn quickly around a central point.
　　It emphasizes the continuity of the action, and usually the narrow extent of
　　the circular motion.
　　The wheel is spinning on its axis.
　　(急转) whirl: To round very fast.
　　It implies the lock of conscious control.
　　The leaves whirl in the wind in the yard.
　　(转动) rotate: To turn round a fixed point with a circular movement.
　　The earth rotates once every 24 hours.
　　(绕转) revolve: To turn or move in a circle around a central point.
　　It indicates circular or elliptical (椭圆) movement.
　　The planets revolve around the sun.