Tracer bullet
曳光子弹
🧩 词语组成解析
tracer
['treisə]
n. 追踪者，描图者，（铁笔等）绘图工具;
🗣️ 情景例句
This is Gao Qiang in Room 409.
我是409房间的高强。
Do you ever do exercises on Saturday?
你曾经在星期六做练习吗？
By then, however, in many places the grass had already taken root.
然而到那时，很多地方的草已经生了根。