Tracer composition
[化] 曳迹剂
🧩 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
Do you have family in New York?
在纽约有亲人吗？
John has extracurricular activities. He's on the football team.
约翰有课外活动。 他参加了足球队。
The twin towers are 110 storeys high, but high-speed lifts controlled by computer take only a minute to reach the top.
这座双塔式大楼有110层高，而由电脑控制的高速电梯只需一分钟就可以到达塔顶。