名额的英文：
particular number of pple
quota

参考例句：

Please note that Quota limits to 50 persons and the enrollment is done on a first-come-first-served basis.
请注意,名额仅50位,先到先得。

We still have vacancies for secretaries but other positions have been filled.
我们的秘书名额尚有空缺，但其他职位都满了。

Thirty people had to compete for only ten openings.
三十个人必须只为十个名额来竞争。

particular是什么意思：
adj. 特别的，独有的；详细的；挑剔的
n. 详细说明；个别项目；特点

particular description
详细的描述

The work is complete in every particular.
工作的每个细节均己完成。

A particular detail or circumstance.
详情详尽的细节或情形

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。

pple是什么意思：
n.类胸膜肺炎微生物