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
His appearance is impressive.
他的外表给人印象深刻。
When do you expect to have this ready for sale?
你希望此种商品何时上市出售呢？
We found it difficult to work with him.
我们发现和他共事很难。