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2013-05-23 12:21
求翻译： But he also got an idea. He designed a goat milking machine that does not require any electricity or motors. The Henry Milker is a hand-operated vacuum pump. A person attaches a tube to the goat and, after a little pumping, the milk begins to flow. A gauge measures the pressure of the suction.是什么意思？ 待解决
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- 离问题结束还有
But he also got an idea. He designed a goat milking machine that does not require any electricity or motors. The Henry Milker is a hand-operated vacuum pump. A person attaches a tube to the goat and, after a little pumping, the milk begins to flow. A gauge measures the pressure of the suction.
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