assay|assaying

我们需要化验这些金条的纯度。

We need to ___assay the purity of these gold bars.

科学家正在检测这块矿石的金属含量。

Scientists are ___assaying this ore to measure its metal content.

实验室对这批新药进行了成分检测。

The lab conducted an ___assay on the new batch of medicine.