adj.可追蹤的；起源于
Most telephone calls are traceable. 大多數(shù)電話都可查出是從哪里打來的。
It's a tradition that is traceable back to the 15th century. 這是一個傳統(tǒng)，起源于十五世紀。
adj.難追蹤的(難以發(fā)現(xiàn)的；難以描繪的)
