复数的英文：
plural
complex number

Give me the plural form of the noun.
告诉我这个名词的复数形式。

The verb should be in the plural.
这个动词应用复数形式。

'Chair' is in the singular;'chairs'is in the plural.
chair是单数形式，chairs是复数形式。

Fish as a countable noun has two plural forms.
Fish 一词作可数名词时有两个复数形式。

The indication,as by inflection,of the singularity or plurality of a linguistic form.
数如通过屈折变化对语言形式单数或复数的标示

An extremely fast - moving part of a river,caused by a steep descent in the riverbed.Often used in the plural.
急流，湍滩由于河床倾斜下降而形成的流动极快的河流的一部分，常用复数

Ancient greek had the dual but it has merged with the plural form in modern greek.
古希腊语中有双数，但在现代希腊语中已同复数形式合并在一起了。

A tool,such as pliers or pincers,used for squeezing or nipping.Often used in the plural.
钳子，镊子一种用来挤紧或夹住的工具，如钳子或镊子，常用于复数

A tract of unproductive land,often with a scrubby growth of trees.Often used in the plural.
贫瘠地，不毛之地一块贫瘠的土地，通常树木低矮。常用复数

A piece of furniture serving as a playing surface,as for faro,roulette,or dice.Often used in the plural.
赌桌供玩游戏用的一件家具，如法罗赌博、轮盘赌或掷骰游戏时所用的桌子。常用作复数

Heavens here is plural.
这里的天这个名词用的是复数形式。

Data is a plural noun.

The verb should be in the plural.
这个动词应用复数形式。

It was a complex problem.
这是一个复杂的问题。

an inferiority complex
自卑情结.

The more complex the civilisation, the more complex are its systems.
社会的文明程度越高，它的这些体系就越复杂。

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。