Ballistics don't match, and his gun was never fired.

弹道学不匹配，而且他的枪根本没有发射过。

Ballistics: the study of the dynamics of projectiles.

弹道学：关于射弹动力学的研究。

Ballistics tests will help explain what happened, he said.

弹道检测有助于解释事情真相，他说。

A ballistics expert was taking evidence at the scene of the crime.

一位弹道学家正在犯罪现场提取证据。

The method is suitable to all models of interior ballistics of guns.

这种方法可适用于任何火炮内弹道模型。