力学功

结果表明：整理后水田面积增大，斑块形状规则，有利于机械化作业和田间管理，但同时景观多样性略有降低。

rubber bellows mechanical seal【机】

mechanical【机】;mechanistic【机】

mechanical energy

Bennett Mechanical Comprehension Test

mechanical isolation

impulse, mechanical

mechanical resistance

conservation of mechanical energy