Quinquevalent
a. 有五种不同原子价的, 五价的\\n[医] 五价的
🗣️ 情景例句
do I really have to
我是不是真的有必要
Every advantage has its disadvantage.
有利必有弊。
Dad, this box is too heavy. We can't carry it.
爸爸，这个箱子太重了，我搬不动。