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With her hands steady at the controls, her voice calm as she spoke to mission control, Collins piloted the craft through a slow, graceful somersault. With the shuttle's underside now visible, the damage was quickly spotted - and a spacewalk was carried out to repair it.
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每轮遍历后，最大元素会"冒泡"到末尾
Wes Streeting, Health Secretary in England, says he wants screening in place but only if it's "backed by evidence".