航天飞机每4或5个月更换一次乘组。

Space shuttles replaced the crew every four or five months.

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2002年，空间站上继续保留着3人乘组。

In 2002, the station continued to operate with a crew of three.

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接下来的工程是扩建用以支撑6或7人专职乘组的电力供应和生命保障系统。

The next stages of construction were to expand the station's power and life-support systems to support a full-time crew of six or seven.

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