他们正在使用各种化学试剂。

They are using various ___chemicals.

实验室里储存着各种危险的化学品。

The lab stores various hazardous ___chemicals.

这些蔬菜不含任何有害化学物质。

These vegetables don't contain any harmful ___chemicals.

这些化学物质能帮助提高农作物的产量。

These ___chemicals can help increase crop yields.