Most scientists now think that the moon was once part of Earth.为什么这里的part前面没有加a?trains travelling to different parts of a city mean fewer cars and buses on our roads.为什么mean不加s?不是应该动名词做主语用三单
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![Most scientists now think that the moon was once part of Earth.为什么这里的part前面没有加a?trains travelling to different parts of a city mean fewer cars and buses on our roads.为什么mean不加s?不是应该动名词做主语用三单](/uploads/image/z/7315020-36-0.jpg?t=Most+scientists+now+think+that+the+moon+was+once+part+of+Earth.%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%99%E9%87%8C%E7%9A%84part%E5%89%8D%E9%9D%A2%E6%B2%A1%E6%9C%89%E5%8A%A0a%3Ftrains+travelling+to+different+parts+of+a+city+mean+fewer+cars+and+buses+on+our+roads.%E4%B8%BA%E4%BB%80%E4%B9%88mean%E4%B8%8D%E5%8A%A0s%3F%E4%B8%8D%E6%98%AF%E5%BA%94%E8%AF%A5%E5%8A%A8%E5%90%8D%E8%AF%8D%E5%81%9A%E4%B8%BB%E8%AF%AD%E7%94%A8%E4%B8%89%E5%8D%95)
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