If his mother says, “Brush your teeth,” Billy brushes his teeth.
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billy brushes his teeth
比利刷牙
以上为机器翻译结果，长、整句建议使用 人工翻译 。
If his mother says, "brush your teeth," Billy brushes his teeth.
如果妈妈说“刷牙”，比利就去刷他的牙齿。
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