Trace constituent
[化] 痕量成分
🧩 词语组成解析
trace
[tres]
vt. 跟踪，追踪;追溯，探索;探索;查找;
vi. 沿着一小径或道路前进;可以追溯的;
n. 痕迹，踪迹;微量，极少量;[植]（脉）迹;痕迹;
trace(draw)→回溯
🗣️ 情景例句
The most important thing is for you to decide your own future.
最重要的是你要自己决定自己的未来。
I subscribed to a lot of periodicals last year.
去年我订了许多期刊。
You must look after it. Give it to Mr. Hu.
你一定要好好保管啊！让胡老师帮你拿着。