Two main trade groups serve the barter exchange industry.
二家主要易货交易机构服务于易货行业。
Facilitates effective information exchange between multiple groups.
促进多个团体之间有效的信息交换。
A: Great! Now please exchange your presents in groups.
非常好，下面请同学们在组内交换礼物。
A: Great! Now please exchange your presents in groups.
非常好，下面请同学们在组内交换礼物。
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