Preserve grading in these areas to protect grass seed mixtures planted in the exposed region.保护种植在开阔地的绿化地带.The grading capacitor chiefly consists of body, metal expanders, impregnant and porcelain bushing.断路器电容器由器身 、 扩张器...
Science fiction stories often mention robots that can talk.科幻小说常提到会说话的机器人。Most mobile robots are still in the design stage...大多数移动机器人仍处在设计阶段。They can also become rolling loops or bipedal, walking robots.链型机器人也可以组装成环型的滚动机...