1. 定量;定额;配额
    A quota is the limited number or quantity of something which is officially allowed.

    e.g. The quota of four tickets per person had been reduced to two.
           每人可购买的票的限额已经由四张降至两张。

2. (给予某团体的)限额，配额
    A quota is a fixed maximum or minimum proportion of people from a particular group who are allowed to do something, such as come and live in a country or work for the government.

    e.g. The bill would force employers to adopt a quota system when recruiting workers.
           该法案将迫使雇主在招聘工人时采取限额制度。

3. 配额;份额;指标
    Someone's quota of something is their expected or deserved share of it.

    e.g. They have the usual quota of human weaknesses, no doubt.
           毫无疑问，他们身上也有人所共有的弱点。