Boundary trace
[计] 边界道
🧩 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
Just listen to the sound.
听听这些声音。
You'd better run or you're going to be left behind.
你最好跑不然你将落在后面。
he answered me, but he spoke neither slowly nor clearly.
他回答了，但他讲得既不慢也不清楚。