Perfect number
[计] 完全数
🧩 词语组成解析
🗣️ 情景例句
but when I received the letter
但是当我收到那封信
The greatest of faults is to be conscious of none.
最大的错误就是不认识错误。
It is a good idea to start a part-time job so long as it does not affect your studies.
只要不影响学习，干兼职工作的想法是不错的。