v.(使)下沉, (使)沉没( sink的过去式 );
例句:
The morale of the enemy forces sank to a very low level.
敌军士气十分低落.
The flames at last sank down and the fire went out.
火焰最后弱下来,火就灭了.
He sank all his savings into the firm.
他把他所有的积蓄都投入了这家公司.