穆勒说：“对我们来说，最有可能的解释似乎是，这一现象的根源在于它们与人类生活在一起，这让它们接触了大量人类的面部表情。”而这种接触也为它们提供了很多机会来学习区分它们。

"To us, the most likely explanation appears to be that the basis lies in their living with humans, which gives them a lot of exposure to human facial expressions," and this exposure has provided them with many chances to learn to distinguish between them, Muller said.

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当然，霍弗尔兹的数据也显示，孩子们不做家务的原因之一在于他们花在读书、学习和青年社团等“更有价值”活动的时间增加了。

Of course, children aren't doing housework partly because they're spending more time on such worthy pursuits as reading, studying and youth groups, Dr. Hofferth's data show.

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成功在于勤奋，学习英语也同样如此。

Success lies in hard work. So it is with the learning of English.

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