Sterad
球面(角)度, 立体角度的单位
🗣️ 情景例句
Yes, sir.
带来了 ，先生。
If it hadn't been for your help, we would never have finished it.
如果没有你的帮助，我们永远完不成任务。
That's all right. Thank you. Goodbye!
好的。谢谢你，再见！