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It could also insist on checking private manned spacecraft as thoroughly as it does commercial aircraft.
它还可以像检查商用飞机一样彻底检查私人的载人航天器。
In thirty years from now the United States should have a manned spacecraft on Mars.
从现在开始30年内,美国会把载人航天器送上火星。
Manned spacecraft are also in danger.
载人航天器也将处于危险之中。
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