Trace line
[計] 跟蹤行
?? 詞語組成解析
trace
[tres]
vt. 跟蹤，追蹤;追溯，探索;探索;查找;
vi. 沿著一小徑或道路前進;可以追溯的;
n. 痕跡，蹤跡;微量，極少量;[植]（脈）跡;痕跡;
trace(draw)→回溯
line
[la?n]
n. 線條;排;行列;界線;
vt. 排隊;用線標出;沿…排列成行;給…安襯里;
vi. 形成一層;排隊;擊出平直球;
??? 情景例句
study for my math final.
溫習數學 準備期末考試。
Two blacks do not make a white.
兩個烏黑不等于一個清白。
A recent survey of the effects of noise revealed (surprisingly?) that dogs barking incessantly in the night rated the highest form of noise pollution on a scale ranging from 1 to 7.
最近一個有關噪音的作用的調查（令人吃驚地）指出，夜間連續不斷的狗叫聲，在一個從1級至7級刻度表上應列為最嚴重的噪間污染。