Ballistics
n. 弹道学, 发射学\\n[化] 弹道学
📖 牛津释义
ballistics
n[sing v]
study of things that are shot or fired through the air, eg bullets, missiles, etc 弹道学（对射击或发射之物如子弹、导弹等的研究）
[attrib 作定语]
a ballistics expert 弹道学专家.
🗣️ 情景例句
And this is Alexandra Pappas.
这位是Alexandra Pappas。
The doctor advised me to take a walk outdoors.
医生劝我要多到户外散步。
This was indeed the case.
但事实上确有此人。