开往美国的货运飞机必须符合特定的安全要求，其中包括必须通过安全扫描以及工作人员的核定，还得向当局提前发送舱单。
Cargo shipped on planes to the United States must meet certain security requirements, including for screening, vetting of personnel in the facilities and providing advance manifests to authorities.
设计所出的那个航天舱的无人版本可以为空间站的工作人员携带重达6吨的美食，或者能够将航天舱替换为重型卫星。
The unmanned version of that capsule is designed to carry six tonnes of goodies for the inmates of the space station, or could be replaced by a heavy satellite.
经济舱机票对一般工作人员比较合适，因为它的价格要便宜得多。
An economy class air ticket is fit for ordinary workers, because it costs much less.
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