买一只塑胶鸭子给一个朋友？海盗船还是鸭子形拖拉机？木制积木还是建筑套装？羊驼拉玛会得到什么？

Buy a friend a rubber duck? Pirate ship or tractor duck? Wooden blocks or building set? What will Llama Llama get?

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船式耕作机械中的机耕船、机滚船、船形水田拖拉机都是利用浮式工作原理，在深泥脚水田的耕作中有很好的适用性。

Weigeng ship, Roller-ship and Boat-shaped paddy tractor in boat-farming machinery are working in the principle of floating, which have a good application of farming in the deep mud .

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本文论及船式拖拉机的“浮式”工作机理及其性能。

This paper refers to the float mechanism and the characteristics and performances of boat-tractor b.

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