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1. This new model of palm-bone tractor has been designed to improve efficiency in agricultural operations.
这款新型的棕榈骨拖拉机被设计出来，以提高农业作业的效率。
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2. The farmer used the palm-bone tractor to till the soil and prepare the ground for planting.
这位农民使用棕榈骨拖拉机来翻土并准备土地种植。
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3.The old man was so proud of his palm-bone tractor that he often showed it off to visitors.
那位老人对他的棕榈骨拖拉机非常自豪，他经常向游客展示它。