Definition: If a telephone or public toilet is engaged, someone is already using it. Level: B1
每次我打电话给她，电话线路都占线。
Every time I call her, the phone line is ___engaged.
厕所门上的牌子显示正在使用中。
The sign on the toilet door showed it was ___engaged.
我试着打电话，但号码总是占线。
I tried to phone, but the number was always ___engaged.
