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School buses are one of the safest forms of transportation for children.
对孩子们来说，校车是最安全的一种交通工具。
youdao
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This week we have been working on different forms of transportation.
这周我们学习了不同类型的交通工具。
youdao
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This week we have been working on different forms of transportation.
这周我们学习了不同类型的交通工具。
youdao