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Every day he rides on a bike with a mailbag from one house to another.
每天他骑着自行车，带着邮包从一家转到另一家。
youdao
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Don: Time to go again to the a Moment of Science mailbag.
唐：又到了科学一刻读信时间了。
youdao
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Don: Time to go again to the a Moment of Science mailbag.
唐：又到了科学一刻读信时间了。
youdao