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
I'm sure you can, Ellen.
说的没错， Ellen。
If he doesn't , will you take one?
如果他不，你会拿一个吗？
I don't think this is a standard size.
我看这不是标准尺寸吧？