浓度

在进入具有极强挥发性与高浓度毒性化学原料车间作业前，所有检修工人必须穿戴好全密闭专业防护服。

zài jìn rù jù yǒu jí qiáng huī fā xìng yǔ gāo nóng dù dú xìng huà xué yuán liào chē jiān zuò yè qián, suǒ yǒu jiǎn xiū gōng rén bì xū chuān dài hǎo quán mì bì zhuān yè fáng hù fú.

All maintenance workers must wear fully enclosed professional protective clothing before entering workshops with extremely volatile and highly toxic chemical raw materials.

密闭地下管道内部往往积聚着高浓度的硫化氢毒气，贸然进入极易引发缺氧窒息危险。

mì bì dì xià guǎn dào nèi bù wǎng wǎng jī jù zhe gāo nóng dù de liú huà qīng dú qì, mào rán jìn rù jí yì yǐn fā quē yǎng zhì xī wēi xiǎn.

High-concentration hydrogen sulfide poisonous gas often accumulates inside closed underground pipelines. If it enters rashly, it can easily lead to the risk of hypoxia and suffocation.