Untrace_var is permitted at safe level 4.
untrace_var在safe level4是允许的。
Really, the safe level of exposure is no exposure.
吸烟真正的安全水平就是一点儿都不吸。
There is no safe level of second-hand tobacco smoke.
二手烟草烟雾没有安全标准。
It says there's no known safe level of lead in the body.
目前没有已知的人体铅含量安全水平的数据。
There is no safe level of exposure to second-hand tobacco smoke.
关于二手烟草烟雾，不存在安全接触水平。
There is no safe 'low tar' cigarette and no safe level of smoking。
没有所谓的 “低焦油”香烟，也没有所谓的安全吸烟方式。
There is no safe 'low tar' cigarette and no safe level of smoking.
没有所谓的“低焦油”香烟，也没有所谓的安全吸烟方式。
The World Health Organization's determined "safe" level is 25.
而世界卫生组织确定的“安全”水平为25微克。
Is there a 'safe' level of radiation exposure for a patient during pregnancy?
是否有患者在怀孕期间的“安全”辐射暴露上限？
Is there a 'safe' level of radiation exposure for a patient during pregnancy?
是否有患者在怀孕期间的“安全”辐射暴露上限？
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