从业人数的英文：
number of people engaged

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。

people是什么意思：
n. 人，人们；人民，民族；雇员，支持者；客人，朋友；家人，亲人
v. 居住在，把...挤满人

They are the unworldly people.
他们是无俗念的人们。

Compare person,persons,people and peoples.
试比较person.persons,people,和people的用法

The government of the people, by the people, and for the people shall not perish from the earth.
民有、民治、民享的政府永世长存。

engaged是什么意思：
adj. 从事……的，已订婚的，被占用的

Be engaged in; be Busy in
从事于

I will engage to manage the business if you will engage to provide the capital.
如果你答应出资本，我答应经营这个事业。

We have to engage the room in advance.
我们不得不提前预订房间。