Every time you put on a different pair of shoes, your interaction with the ground changes slightly, thus you stride differently.

每次你穿不同的一双鞋，你与地面的相互作用会产生略微的变化，因此你的步幅是不同的。

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In the earlier study of SLA, the main focus was on whether pair or group interaction could provide each member with Comprehensible Input which has been claimed to be a crucial element in SLA.

在早期的二语习得研究中，人们关注的焦点是检验小组或对子之间的互动是否能为每个成员提供二语语言习得中的一个重要因素：可理解输入。

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The Raman interaction of a pair of two-level atoms with the radiation field is studied.

研究了两个双能级原子与单模辐射腔场的喇曼相互作用。

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