illicit trade的用法和樣例：
例句
- Loyang was a depot in the growing smuggling trade, and its commerce could hide industrial depression.
但在初來乍到的人看來，衰退並不顯眼，作為日益蓬勃的走私業的大貨棧，洛陽的商業繁榮足以掩蓋其工業的頹敗。 - Officious immigration and customs officers scrutinised documents and searched cabins for stowaways or illicit goods.
一本正經的邊境和海關官員仔細檢查文件，在車廂里搜索偷渡者和走私貨物。
