Make sure you don't smoke here.

你一定不要在这里吸烟。

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今天的几个句子是有关表达警告的：

1. Leave the dog alone!离狗远点！

2. Don't try and tricks!别耍花招！

3. I warn you! 我警告你！

4. Don't lose your head! 别忘乎所以！