Мерц резко сменил риторику во время встречи в Китае09:25
* @param arr 待排序数组
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外祖父母和子女的全家福，摄于1970年。（受访者供图）
His thesis at the Navy Academy was in the unheard-of topic of liquid-fuel engines. After graduation, he hoped to specialise in this pioneering new technology.