reagent|reagents

我们需要一种特殊的试剂来检测水中的重金属含量。

We need a special ___reagent to detect heavy metals in the water.

我们需要购买新的试剂来做这个化学实验。

We need to buy fresh ___reagents for this chemistry experiment.

实验前请确保所有化学试剂都已正确标记。

Make sure all ___reagents are properly labeled before the experiment.