Perfect obligation
[法] 合法的债务, 具有完备手续的债务
🧩 词语组成解析
🗣️ 情景例句
So save your voices till then.
所以， 留着点嗓子。
Went on to get his master's degree from harvard.
然后在哈佛大学取得了学士学位。
Then, instead of having someone answering the phone all day, people can ring up the railway station and listen to a tape recording of the information.
然后，人们可以打电话到火车站，从录音电话中获取信息，而不要安排一个专人整天接电话。