1.
broken step chain device
梯级链断裂安全装置
2.
the rounds of a ladder
梯级, 梯子的横档
3.
megaton TNT equivalent
百万吨级梯恩梯当量
4.
A step in a straight stairway.
（平行）梯级一段直楼梯中的一级
5.
one of the crosspieces that form the steps of a ladder.
一块组成楼梯梯级的横档。
6.
individual-rung ladder
各节梯级都固定在建筑物上的梯子
7.
foot of the stairs
一段楼梯的最下一级
8.
head of the stairs
一段楼梯的最上一级
9.
lower echelon automatic switchboard
低级阶梯自动配电盘
10.
He that climbs a ladder must begin at the first step .
登梯须从第一级开始。
11.
cascade hydroelectric power stations on Columbia River
哥伦比亚河梯级水电站
12.
sitting on the top/bottom step
坐在最上[下]的梯级上.
13.
subcarrier phase correcting steps
副载波相位校正梯级
14.
graduated base relief gradient
分等级的基准宽减梯度
15.
Each flight of stairs has 20 steps.
每段阶梯有二十级。
16.
At the end of the passage there are three stairs.
过道头上有三级楼梯。
17.
He ran up the steps two at a time.
他一次跑上两级阶梯。
18.
It has to run down the terraces.
而必须沿着梯田一级一级地流下，