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
China is implementing a family planning policy.
中了在实施计划生育政策。
The pen is mightier than the sword.
文能胜武。
Is that tin of tobacco for me?
那听烟丝是给我的吗？