"The fact that a Sylvia Plath may die young does not necessarily mean an Introduction to Poetry class should carry a warning that poems may be hazardous to one's health, " he said.

像西尔维亚·普拉斯这样的诗人可能英年早逝，但这并不等于我们应该在诗歌欣赏课上警告学生：诗歌威胁身心健康。

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As explained in the definitions of the NEMA Types 7 and 9. The groups (indicated by letters), which follow the type class, indicate the gas or vapor atmospheres within the hazardous locations.

在NEMA类型7和9定义中以加以说明。组(用字母标明)，标记在类性和类别之后，表示危险区域内的气体或蒸汽环境。

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The groups indicated by letters, which follow the type class, indicate the gas or vapor atmospheres within the hazardous locations.

组用字母标明，标记在类性和类别之后，表示危险区域内的气体或蒸汽环境。

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There was another class of hazardous chemical present: polychlorinated biphenyls (PCBs).

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Going beyond the MIL-STD-810G certification with the ability to withstand a six-foot drop, and with a shock-mounted hard drive, magnesium alloy case and UL1604 Class I Division 2 certification, this mobile computer is optimized to operate in hazardous and mission-critical environments.

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