This toxin is one of the most dangerous substances on earth.

这种毒素是地球上最危险的物质之一。

Brief all crew members on symptoms caused by dangerous substances.

对所有船员简介危险品伤害的症状。

These new dangerous substances then damage the genetic content of our cells.

这些新的有害物质会损害细胞中的遗传基因DNA。

Work involving the use of dangerous substances i. e. radioactive material and explosives.

使用危险材料的作业，如放射性材料和易爆炸材料。

Avoid tall buildings or structures to avoid hazards, tall, Xuangua Wu or other dangerous substances.

避开高大建筑物或构筑物避开危险物、高耸、悬挂物或其它危险物品。