Obligative
专性的
🗣️ 情景例句
Hi-tech companies are making big bucks nowadays.
现在高科技公司是最赚钱的。
Which umpire will referee the baseball game?
不知道哪一个裁判要执法这场棒球赛？
Ann ran to the door, and found Li Lei outside.
安跑到门口，看见李磊在门外。