Obligative
专性的
🗣️ 情景例句
He jumps from one job to another.
他经常换工作。
Be slow in choosing a friend; slower in changing.
选择朋友要审慎，摒弃更要审又慎。
Fortunately, nothing was found and five hours later we were able to take off again.
幸运的是，什么也没有找到。5个小时后，我们又起飞了。