Pstn
[计] 公用电话交换网
🗣️ 情景例句
A guarantor is responsible for the loan
担保人要对贷款负责
The finest diamond must be cut.
玉不琢不成器。
that people have for years assumed that the process of losing vigour with time,
多年来就已认识到。生命力随着时间流失而丧失活力，