He said NASA will now add an additional flight in 2027 in which astronauts will dock with new commercial moon landers in low-Earth orbit for detailed tests of navigation, communications, propulsion and life support systems and to verify rendezvous procedures.
1. 建堆：将数组构建成大顶堆（父节点 = 子节点）
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They were taking part in the first crewed test flight of the Starliner spacecraft, developed by aerospace company Boeing.