The surgeon general says there is no safe level of secondhand smoke.

外科医生主任说,二手烟是种不安全因素.

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In some parts of Hong Kong, pollution readings were double the safe level.

在香港的部分地区, 污染指数是安全读数的两倍.

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To keep stock quantity in a safe level and make sure the material supplied on time.

保持库存数量处于安全水平,保证及时到货.

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Contemporary produce quality should include underlying tone, explicit quality and safe level 3 respects.

现代农产品质量应包括内在品质 、 外在质量和安全标准三个方面.

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