1、
He's giving her French lessons in exchange for ( ie as an exchange for) her teaching him English.
他教她法语，她教他英语，互教互学（作为交换条件）。
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He's giving her French lessons in exchange for ( ie as an exchange for) her teaching him English.
他教她法语，她教他英语，互教互学（作为交换条件）。
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