老解放区和五十年代初期曾经施行过的农业劳动互助的简单形式，指农民互相以人力、畜力、农具等换工形式互助。
... Professional International Labor Exchange 国际劳务交流 exchange labor 变工 exchange of labor 劳动交换 ...
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参加变工队的农民，各以自己的劳动力或者畜力，轮流地给本队各家耕种。
Peasants who joined labour-exchange teams contributed their Labour power or animal power to cultivate the land of each member-family collectively and in rotation.
我们还真的拍到，这些勤奋的环保志工下雨天时努力工作，向这群想要让地球变的更好的志工深深致敬。
We caught these diligent recycling volunteers on tape, working away on a rainy day. Bravo to them for their dedication to make the world a better place.
在本论文中，我们采用高频宽效率的正交分频多工调变系统。
In this thesis, we adopt the bandwidth-efficient OFDM system, which can adjust efficiency of bandwidth usage.
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