求翻译：相反，美国的孩子早已在做自己的社会实践作业了。他们的老师每次只布置一个课题作为作业，让你运用各种渠道，在一定期限内完成。这就有了自主学习的说法。是什么意思？

Instead, the children already in the United States to do their job of social practice. Their teachers for each subject as a work arrangement only, so you use a variety of channels, in a certain period of time to complete. This independent study has to say.

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On the contrary, US's children were already making own social practice work.Their teacher each time only arranges a topic to take the work, lets you utilize each kind of channel, completes in certain deadline.This had the independent study view.

Instead, the United States children have social practice of doing your homework. Their teachers time layout of a topic as a job, let you use various channels, within a specified period. This independent study said.

Instead, the children already in the United States to do their job of social practice. Their teachers for each subject as a work arrangement only, so you use a variety of channels, in a certain period of time to complete. This independent study has to say.