他们采取了有效措施防止有毒气体泄漏。
They took effective measures to prevent poisonous gases from escaping.
在厂区显著位置设置风向标，万一发生有毒气体泄漏时，便于人员安全撤离。
The wind vane shall be set at distinct positions in the plant area so as to facilitate safe evacuation of the personnel in case of any leakage of toxic gas es.
另有数百名该州平民由于担心飓风可能导致有毒气体泄漏而离开了堪萨斯州。
Hundreds of people, afraid that the tornadoes could lead to gas leakage, have evacuated from Kansas.
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