词汇	arc arch pipe
释义	arc arch pipe 圆弧形拱管
随便看	labo u r-saving technology labour-saving labo u r-saving labour-saving appliance Labour-saving cultivation labour saving device labour-saving device labour-saving devices labour-saving domestic appliances labour saving equipment labour-saving equipment labo u r-saving equipment labour-saving household appliances labour saving industry labour-saving industry labour saving invention labour-saving invention labour saving investment labour-saving investment labo u r-saving investment labour-saving machinery labour saving machinery industry labour-saving method labour saving ratio labour-saving ratio