数轴的英文：
number axis
n. 数；号码；算数
v. 给…编号；计算，数
The number was fifty.
该数字为五十。
There is safety in numbers
人多势众
It was an irrational number.
这是一个无理数。
Which number on the card is a prime number?
在卡片上哪一个数字是最初的数字？
The number raised to the logarithm of a designated number in order to produce that designated number.
被升到指定数字的对数上的数量,是为了得到那被指定的数目。
n. 轴，光轴，核心，轴心国
transverse axis
【数】横截轴
three-axis trainer
三自由度练习器
Next to or facing the main stem or axis.
近茎轴一侧的紧挨着主茎或轴的，面向主茎或轴的
The centre of gravity is displaced by a weight below the rotational axis.
调节旋转轴之下的一个重物，使重心发生位移。
The central suspension beam is always in axis with the front pier.
中间吊架总是在前墩柱中心线处。