milk的过去分词和过去式：milked
v.挤奶;趁机牟利;捞一把;捞好处
例句：
Some are milked four to six times a day.
还有一些一天可以挤四到六次。
The cows get to decide when they want to be milked.
所以，这些奶牛想什么时候产奶都可以。
He had never milked all alone before, but it seemed almost easy.
他从前从未独自挤过牛奶，不过这似乎并不是很难。
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