debt

1.debt统指“债”。a debt是“一笔债”。debts是“多笔债”。

2.说“负债更多”或“受惠更多”该说more in debt，不可说in more debt。

3.The compiler of such a book as this is necessarily under a heavy debt to previous writers里的a不可省去。

4.“因欠债而被监禁的人”该说prisoner for debt。