名词
中文翻译：滚筒扩张器同义词
同义词：
['roller pump', 'roller expander pump']
例句：
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1. The roller expander is used to expand the soil before planting.
滚筒扩张器用于在种植前扩展土壤。
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2. The roller expander helps to loosen the soil and prepare it for planting.
滚筒扩张器有助于松散土壤，为种植做好准备。
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3. The roller expander is a useful tool for farmers to improve their crop yields.
滚筒扩张器是农民提高作物产量的有用工具。