}The ? prefix goes on the type: ?int, ?string, ?User. You construct values with some() and signal absence with none:
深夜里，房子安静地“醒”着。空调记得孩子的爱踢被的习惯，灯光记得家人起夜的行走路线，摄像头认得每一个家庭成员的身影。它们不说话，却一直在听。它们不打扰，却一直在服务。
，详情可参考有道翻译
Waymo无人驾驶出租车正式登陆纳什维尔
Фото: MOD Russia / Globallookpress
The benchmark is organized into four domains: general chat, STEM, mathematics, and coding. It originates from 110 English source prompts, with 50 covering general chat and 20 each for STEM, mathematics, and coding. Each prompt is translated into 22 scheduled Indian languages and provided in both native and romanized script.