15.

ballistics
彈道學(xué)

[雙語解釋]

The science of firearms and the study of the motion of bullets.
研究火器及子彈運(yùn)動(dòng)的科學(xué)。

例句：

A ballistics expert was taking evidence at the scene of the crime.
一位彈道學(xué)家正在犯罪現(xiàn)場提取證據(jù)。