火箭发射是一项极其复杂的程序，需要大量工作人员的参与。
Rocket launching is a complicated process which requires participation of numerous staff members.
当一个自然史博物馆需要办展览时，工作人员却往往得通过认真的研究工作，获得大量的资料和实据，从而造出一件活生生的展品来。
When a natural history museum wants an exhibit, it often must build it realistically-from a mass of material and evidence brought together by careful research.
干洗加盟店并不需要大量训练有素的工作人员对大薪俸及往往只有极少数的一部分时间，工作人员正在实际需要。
Dry cleaning franchise stores do not require heavily trained staff on large salaries and often only a few part time staff members are actually required.
干洗加盟店并不需要大量训练有素的工作人员对大薪俸及往往只有极少数的一部分时间，工作人员正在实际需要。
Dry cleaning franchise stores do not require heavily trained staff on large salaries and often only a few part time staff members are actually required.
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