成百上千：hundreds of ['hʌndrədz] [ɒv; (ə)v]
成千上万：thousands of [ðəˈɵauzəndz] [ɒv; (ə)v]
hundreds of
释义：许多，数百万的
词组：
（1）hundreds of students 上百个学生 ; 几百个学生 ; 数百学生
（2）hundreds of trees 上百棵树
（3）hundreds of knives 数百把小刀
双语例句：
（1）这家饭店每天接待数以百计的顾客。
The restaurant receives hundreds of customers every day.
（2）但在雇主掌握主动权，并有数百名合格的候选人可供选择时，你怎么能做到这点 呢？
But how can you do this when the employer has the upper hand and hundreds of qualified candidates?
（3）他在几百件行李中认出了自己的行李。
He identified his baggage among hundreds of others.
thousands of
释义：数以千计的，成千上万的，形容数量之多
词组：
（1）thousands years of love 千年之恋
（2）thousands pounds of pressure 千斤之担
（3）Thousands died of famine 数千人死于饥荒
双语例句：
（1）那场战争夺去了成千上万人的生命。
The war swept off hundreds and thousands of people.
（2）他们收集了数以千计的病历来证明吸烟与癌症的关系。
They compiled thousands of case history to prove the relationship between smoking and cancer.
（3）如果我们计算一下所有与会人员的开销及管理费用，一个全天的 团队会议要花费 数千美元。
An all-day team meeting costs thoudsands of dollars, if we calculae the cost of all the people involved along with overheads.