▲ 传统防窥膜结构，图片来自@上海复瞻智能科技
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The answer was the US Navy, which was hungry for new pilots after World War Two. It was not building rockets but at least it involved flying.
在开局阶段、关键时期，能否坚持按规律办事，做到蹄疾而步稳，尤其需要检视政绩观。
Tony Jolliffe/ BBC News