|
21. | light but strong cardboard,or fiberboard with double lids and bottoms,fixed by glue,adhesive tapes,metal |
| 纸箱:一般由坚固轻便的硬纸板做成。上下有盖,用脱水固定,胶带封住,用铁皮或起码钉打包。 |
|
|
| |
22. | century, including the introduction of pedals to sustain tone or to soften it, the perfection of a metal |
| 从此,持续到19世纪的一系列机械上的改进,包括引入踏板以维持音调或使其柔和,改善金属框架,以及使用最佳性能的钢丝。 |
|
|
| |
23. | In accordance with metal material adopted, the wire cable industry can be divided into three types, non-ferrous |
| 线缆工业按照所用金属材料分为有色金属、黑色金属、非金属三类,代表产品分别是:电力电缆、钢丝绳、软光缆。 |
|
|
| |