题目内容
平面任意力系的充分必要条件是力系的和对任意一点的 都等于零。
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卓别林不仅是个天才，还是电影史上最有影响力的人物之一。Chaplin was not just a ______, he was among the most influential figures in film history.
心理学家们使用了许多巧妙的方法试图找出人性的基本成分 究竟是什么。Psychologists try to use many ________ methods to figure out what are the basic components of human nature.
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我仍然记得十年前我姐姐结婚时我父母那满怀喜悦的脸。I still remember the faces of my parents when my elder sister got married 10 years ago.
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