Such controls typically involve the use of local exhaust ventilation, work practice modification, and personal protective equipment in order to reduce exposure potentials.

这些控制一般包括使用局部通风系统、工作实践改善和个人防护用品，来减少暴露浓度。

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The ventilation system didn't work.

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It began in December 1967 when five secretaries at a ventilation and heating company volunteered to work an extra half hour each day without pay to do their bit for the flagging economy.

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The most welcome news is that work is about to start on new ventilation.

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