give up on sb/sth意思是：放弃某任务或目标；失去对某人的信任或信心例句I was trying to fix the broken bike, but I had to give up...

cut it close意思是：卡点儿（做某事）例句I had to run to make it to the meeting on time, but I cut it close.我不得不跑步才...

direct current意思是：直流电例句Most batteries produce direct current, but household electrical outlets provi...

alternating current意思是：交流电例句This machine uses alternating current to generate electricity.这台机器使用交流电生...

on the grounds that意思是：因为例句On the grounds that it was raining heavily, we decided to stay indoors.因为...