四级的的英文：
four stage ;quarternary

参考例句：

In a spherical nucleus, the coupling term implies an interweaving of the quadrupole and dipole motion
对球形核中的耦合项意味着四级运动和偶极运动间的交织。

There 's a moderate east breeze tomorrow.
明天有四级东风

There will be a moderate north breeze tomorrow.
明天将有四级北风

There will be a moderate breeze tomorrow.
明天有四级风

Pass the College English Test band 4; obtain a certificate of CET-6
通过大学英语四级考试/获六级证书

English level at CET 4 and proficient with MS Office operation
英语达四级水平,熟练电脑OFFICE操作

it was like trying to douse a 4-alarm Fire with a water pistol
这就像企图用一把水枪去扑灭一场四级火情警报的大火一样。

A great many proteins, especially enzymes, are oligomeric and consequently possess quaternary structure.
很多蛋白质尤其是酶类,是低聚物,因此拥有四级结构。

four是什么意思：
n. 四；四个；第四

Four divides eight.
4能除尽8。

We have four terms a year.
我们每年有四个学期。

The hunters bagged four deer.
猎人们捕杀了4只鹿。

stage是什么意思：
n. 阶段；舞台；演员的职业；事件发生地；站，架，层；上演
v. 上演；举行；展现；筹划

As the elapse of time, their feeling warms up stage by stage.
随着时间的推移，他们的感情逐步升温。

stage well [Badly]
很[不]适于上演

She was mad about the stage.
她狂热地迷恋着舞台生活。

quarternary是什么意思：
四元的
四进制的
四级的