A system to detect and warn the dangerous gas in the fire ground is researched and developed.

介绍了一个火场内有害气体探测预警系统的设计和实现。

The first suggested that cholera multiplied in the air, a cloud of dangerous gas floated around.

第一种看法是霍乱病毒在空气中繁殖，像一股危险气体在空中到处漂浮，直到找到病毒的受害人。

In 1984 there was a serious accident at a factory in India and a cloud of dangerous gas covered the town of Bhopal.

1984年在印度的工厂有一个严重的事故和危险气体的云覆盖了博帕尔的小镇。