两级的英文：
two-stage

参考例句：

As a two-stage vehicle, the Saturn I had full orbital capability for a variety of payloads
作为一个两级飞行器的“土星Ⅰ”具有可将不同有效载荷送入轨道的能力。

There are two steps up onto the Bus.
上公共汽车有两级踏板。

Tear up the staircases two steps at a time
两级一跨地飞奔上楼

The task for the next few months is to teach those at the prefectural and the county levels how to gain this experience
今后几个月内的任务是教会地县两级取得经验。

Its centerpiece was a communications console on a dais two steps above floor level.
它的中心部件是位于地面两级台阶之上的调度台上的通讯控制板。

Its centerpiece was a communications console on a dais two steps above floor level
它的中心部件是位于地面两级台阶之上的调度台上的通讯控制板。

Using dilution method combined with the two-stage of anaerobic wastewater treatment can reach your objective.
使用稀释结合两级厌气处理方法能达你的目的！

He took her free hand, letting his fingers in between hers, climbed at her side the two concrete steps.
他握住她那只没拿东西的手，手指插在她的手指间，同她肩并肩地跨上两级水泥台阶。

two是什么意思：
num. 二，两个
n. 两个人
adj. 两个的

Knit two, purl two.
两针朝下，两针朝上。

the better of the two
两者中的更好者

What does two and two make?
2加2等于几？

Knit two plain, two purl.
两针平织，两针反织。

The two friends met where the two roads crossed.
这两个朋友在两条公路的交叉路口相遇。

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。

This theatre has a revolving stage.
这家戏院的舞台是旋转式的。

The novel is being arranged for the stage.
正在改编小说使适宜于上演。