It may not be safe to drive right after the procedure.

手术之后马上驾驶汽车可能存在安全隐患.

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Of course, it wouldn't be safe to write the PIN number down.

当然了, 在这儿写下密码不安全.

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Bill: They are concerned that the foods may not be safe to eat.

比尔: 他们担心这些食品吃起来不安全.

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