1. 限制，限定（大小、规模等）
    If you restrict something, you put a limit on it in order to reduce it or prevent it becoming too great.

restrict的解释

    e.g. There is talk of raising the admission requirements to restrict the number of students on campus...
           有传闻称将通过提高录取条件来限制在校学生的数目。
    e.g. The French, I believe, restrict Japanese imports to a maximum of 3 per cent of their market.
           我认为，法国将把从日本的最高进口量限制在其市场总量的3％。

2. 约束，限制(活动或行为)
    To restrict the movement or actions of someone or something means to prevent them from moving or acting freely.

restrict是什么意思

    e.g. Villagers say the fence would restrict public access to the hills...
           村民们说架篱笆能限制公众进山。
    e.g. The government imprisoned dissidents, forbade travel, and restricted the press...
           政府囚禁了持不同政见者，禁止出游，并且限制了新闻自由。

3. 限制，限定（人或其行为）
    If you restrict someone or their activities to one thing, they can only do, have, or deal with that thing. If you restrict them to one place, they cannot go anywhere else.

    e.g. He was, however, allowed to stay on at the temple as long as he restricted himself to his studies...
           然而，只要他专心学习，他就可以继续留在寺庙里。
    e.g. The patient isn't restricted to a meagre diet...
           并没有限制这位病人少吃东西。

4. 将…限制在（某地）；将…限定为（某群体）
    If you restrict something to a particular group, only that group can do it or have it. If you restrict something to a particular place, it is allowed only in that place.

    e.g. The hospital may restrict bookings to people living locally...
           这家医院可能会限定只有当地居民才能预约。
    e.g. Camping is restricted to five designated campgrounds.
           露营被限制在指定的5个野营地。