The series of test flights which it is undertaking are being used to set the final design for a second aircraft, HB-SIB, which will be used to make the global flight.
而正在进行的这一系列测试飞行，其实是为了给用来实现环球飞行的第二架飞机……HB-SIB确定最终设计方案。
The series of test flights which it is undertaking are being used to set the final design for a second aircraft, HB-SIB, which will be used to make the global flight.
而正在进行的这一系列测试飞行，其实是为了给用来实现环球飞行的第二架飞机……HB-SIB确定最终设计方案。
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