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BOCHUM, Germany, July 24 (Xinhua) -- Long jumper Shu Heng leaped 8.09 meters to claim China's first track and field gold medal, while South Africa's teenage sprinting sensation Bayanda Walaza won his ...

ESSEN, Germany, July 21 (Xinhua) -- Slovenian Klara Lukan clinched the first track and field gold medal of the Rhine-Ruhr World University Games with a Games record time of 31 minutes 25.84 seconds in ...

什么是 ？（问号）操作符？ 在TypeScript里面，有3 4个地方会出现问号操作符，他们分别是 三元运算符 // 当 isNumber(input) 为 True 是返回 ? : 之间的部分； isNumber(input) 为 False 时 // 返回 : ; 之间的部分 const a = isNumber(input) ? input : String(input); 参数 // ...