付出的成本绝对不能超过安全控制所带来的优势。
The costs must not exceed the benefits of a security control.
东部地区土壤里的苯含量据说超过安全限制43,000倍。
Benzene levels in its soilare said to be 43,000 times the safe limit.
安全壳内的空气具有相当的辐射性，工作人员最多只能曝露5个小时，否则就超过安全范围。
Its air has been so radioactive, a worker could be exposed only five hours before exceeding a safe limit.
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