饱和土中爆炸
explosion in saturated soils
播种中耕两用机
combined drill-cultivator
播种中耕通用机
drilling and culivating toolbar
弹簧齿式中耕机耙
spring-tined cultivator harrow
封闭式集中培训
Closed centralized training
复式中耕机
omnibearing duplex type cultivator
钢管混凝土中承式桁拱桥
steel concrete half through truss arch bridge