The explosion - proof housing , samplefeed pump are installed in a freestanding sheet - steel cabinet.防爆箱、试样进料泵都装在独立的钢板箱内.Round freestanding sink that is usually placed against a wall.通常靠墙放置的圆形独立式水池.Belfry: bell tower , ...
昆虫生产的防御性化学物质,其种类之多不可胜数.There seems to be no limit to the variety of defensive chemicals produced by insects.防御性的刺长在这些讨人厌的生物背上.Defensive quills dot the backs of these troublesome creatures.现在大家偏好偏防御性的品种.It is now preferre...