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
You've been a great help.
你帮了大忙。
He came at a bad time.
他来的不是时候。
On, hello, Bruce! How are you?
噢，喂，布鲁斯！你好吗？