if (arr[j] arr[j + 1]) { // 升序：前面的大于后面的就交换
Антонина Черташ
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"If you build a nuclear reactor or or any kind of base on the moon, you can then start claiming that you have a safety zone around it, because you have equipment there," says Dr Barber.
FirstFT: the day's biggest stories
Their SpaceX capsule made a fast and fiery re-entry through the Earth's atmosphere, before four parachutes opened to take them to a gentle splashdown off the coast of Florida.