cows eat grass.
the cows eat the grass
the cows are eating the grass
the cows have been eating the grass。
这5句话花的时间是一样的。因为非stressed的词占时间很少。我只看了一点。有兴趣你可以看。
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语言模仿能力是一种天赋,you are rich at this.
-dandelion1-
♂
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09/04/2014 postreply
08:05:17