1. 牧场；牧草地
    Pasture is land with grass growing on it for farm animals to eat.

    e.g. The cows are out now, grazing in the pasture.
           牛现在已经放出去了，正在牧场上吃草。
    e.g. ...mountain pastures.
           高山牧场

2. 更好的地方（或工作、条件）；更好的前程
    If someone leaves for greener pastures, or in British English pastures new, they leave their job, their home, or the situation they are in for something they think will be much better.

pasture是什么意思

    e.g. Michael decided he wanted to move on to pastures new for financial reasons.
           出于经济原因，迈克尔决意去寻找更好的前程。
    e.g. ...nurses seeking greener pastures overseas.
           到国外寻求更好前程的护士们

3. 放牧
    If you put animals out to pasture, you move them out into the fields so they can eat the grass.

4. 让…退休；使赋闲
    If you say that someone is being put out to pasture, you mean they are no longer being employed because they are considered to be too old or no longer useful.

    e.g. I'm retiring next month. They're putting me out to pasture.
           我下个月退休。他们要我养老去了。