Quadrivalent
a. 四价的\\n[医] 四价的
✅ 同义词
🗣️ 情景例句
Oh, the usual problems.
还不是那些老问题。
Where they saw chance, we see law.
以前他们认为是偶然的，现在我们认为是必然的。
If there had not been a hard layer of rock beneath the soil, they would have completed the job in a few hours.
如果不是因为土壤下面有一层坚硬的岩石，他们的营救工作仅用几个小时就可以完成了。