重点讲解:
1. all the time 一直;始终;
例句:He remained silent all the time.
他一直保持沉默 。
2. add up 加起来;累积;
例句:She made a mistake when adding up the bill.
她在合计帐单时出了差错 。
3. help out 帮助…做事;
例句:He helps out in his father's shop after school.
放学后他在他爸爸的店里帮着做事 。
adj. 液体的,液态的
n. 液体