Researchers investigated the effect of so-called "kangaroo care" on the babies' expressions of pain.
研究员根据婴儿对痛苦的表达，对所谓的袋鼠式护理的效果进行了调查。
On this program we explore the history and usage of common expressions in American English.
这期节目中我们将会探索美式英语中常用短语的历史和用法。
On this program we explore the history and usage of common expressions in American English.
这期节目中我们将会探索美式英语中常用短语的历史和用法。
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