Valid argument
[计] 有效论证
🧩 词语组成解析
🗣️ 情景例句
Public transportation is quite convenient in this city.
在这个城市里，公共交通很方便。
How many of these are you going to send him?
你要送多少给他？
The operation, which lasted for over four hours, proved to be very difficult because of the hard resin which covered the skin.
手术持续了4个多小时，非常难做，因为皮肤上覆盖着一层硬硬的树脂。