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
Things have worked out badly.
情况进展得很不理想。
He drinks a lot of milk every day.
他每天都喝很多牛奶。
This is a pretty hot item.
这货十分抢手哩。