Ballistics
n. 彈道學, 發射學\\n[化] 彈道學
?? 牛津釋義
ballistics
n[sing v]
study of things that are shot or fired through the air, eg bullets, missiles, etc 彈道學（對射擊或發射之物如子彈、導彈等的研究）
[attrib 作定語]
a ballistics expert 彈道學專家.
??? 情景例句
What a bargain! Thanks for helping me with this shopping.
真是太劃算了！謝謝你帶我買這些東西。
What''s the cause of the delay?
什么原因延誤？
Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.
某些大公司進行的研究屬于一般和基礎性的研究。因此不保密對他們才有利。