词汇	main crank
释义	main crank meinkræŋk主曲柄
随便看	positive back seat positive backwash effect positive bacteria positive bag-type dust collector positive balance positive balance method positive bar positive barrier positive battery metering positive beam positive bearing positive behavior positive behavior of shareholders positive belt positive benching tunnelling method positive bending force positive bending model positive bending moment positive bending region positive benefit positive beta decay positive beta particle positive bevel positive bias positive biased