如果说出或听到的单词通常被搞乱，那么对我们的耳朵和嘴来说，应当是这些单词共同赋予了我们声音。

And if the words aural and oral are often confused, they should be, for our ears and our mouths jointly gave us our voice.

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当孩子和父母（通常是母亲）共同参与同一件事情或家长读书给孩子听时，研究者同样观察了孩子与父母（通常是母亲）之间的互动

The researchers also observed the interaction between children and their parents -- usually the mother -- as they did a task together or as the parent read a book to the child.

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艾滋病毒与结核病紧密相关，因此“共同流行”或“双重流行”也通常用来形容二者的关系。

HIV and TB are so closely connected that the terms "co-epidemic" or "dual epidemic" are often used to describe their relationship.

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