C4
abbr. 补体4（complement 4）
🗣️ 情景例句
Work harder and practice more.
要更加努力地学习，更加勤奋地操练。
Just for argument's sake, suppose we disagree.
为了讨论各种情形，让我们假设我方不同意时的处理方法。
a brighter promise for the hopeful traveller who has sworn to get away from it all.
而对于发誓用露营来摆脱烦恼的人来说，却带来了更光明的前景。