慢速英语:The Future of Dairy Farming: Robot Milkers

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短语讲解：

1. "The door of the milk opens up, they walk in, they get milked. The door opens up, they walk out."

open up 开拓，开设
例句：They decided to open up an office in town. 
他们决定在市区设立一个办事处。 

2. It uses a laser to find each teat -- the place on the cow where the milk comes out.

come out 出来; 出现
例句：These new products will come out before long. 
这些新产品不久将要上市销售。 

3. Some of them come to be milked in the middle of the night.

in the middle of 在…的中间
例句：It landed smack(-dab) in the middle of the carpet. 
那东西正好落在地毯的中央. 

4. In three years, I will have paid off the difference with this, and I don't have to be the person who's always on call to milk.

pay off 付清
例句：You'll have to pay off your old loan before being allowed a new one. 
你必须还清旧债，才能重新贷款。 

5. The fact that we have a life, and our cows are able to function without us -- to us, it's well worth the money."

be able to 能，会; 能够
例句：How I hope to be able to show you what I feel! 
我多么希望我能让你看出我现在的感情！