作为世界纪录保持者和奥运冠军，悉尼·麦克劳克林-莱弗隆今年选择放弃参加全美锦标赛的400米栏项目，转而挑战400米。她的这一决定不仅展现了她的竞技精神，更体现了她不断突破自我、勇往直前的坚定信念。

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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 // ...