二次的英文：
second (i.e., number two)
second time
twice
(math.) quadratic (of degree two)

参考例句：

Secondary image
二次影像

Secondary electric power supply
二次电源

Secondary colours
二次色

The second session of the 9th National People's Congress
九届二次全国人民代表大会

Secondary literature,eg criticism or reviews of an author's work
二次文献(如对某作者作品的评论)

Number of entries Single Double Multiple Duration of each stay
拟入境次数一次二次多次每次停留天数

Failure to punch your time card two or more times within a pay period
在支薪期间二次或更多次未按时打卡

Intermediate colour: A colour produced by mixing a primary colour with a secondary colour.
间色:原色和二次色混合所造成的颜色。

Monkey entered the cave and did not find his master but he saw the memorial tablets for Heavenly King Li and Nezha.
悟空二次进洞，没找到师父，却见到李天王和哪吒牌位。

Secondary mortgage
二次抵押

second是什么意思：
adj. 第二的；第二次的；次要的
adv. 以第二位
n. 秒；第二名
v. 支持，赞同

the second in command
副司令员

grounded to the second baseman.
打到二垒手位置的滚地球

Down Second Avenue
沿着第二条林荫大道走去

number是什么意思：
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。

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？