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金属切削 metal cutting 机床 machine tool 金属工艺学 technology of metals 刀具 cutter 电路 circuit 半导体元件 semiconductor element 反馈 feedback 发生器 generator 直流电源
Texting Becomes a Health Tool in Kenya Mobile phone use in Africa has spread far, wide and fast. By the end of last year, it was estimated that 70 percent of the population would have a mobile phone. Now, the International Federation of the Red Cross
车缝车间 单针平车 1-NEEDLE LOCKSTITCH M/C 单针链缝平车 1-NEEDLE CHAINSTITCH M/C 人字平车 ZIG-ZAG STITCHES M/C 双针车 TWIN-NEEDLE M/C 钮门车 BUTTONHOLE M/C 钉钮车 BUTTON ATTACHING M/C 打枣车 BARTACK M/C 埋夹车 CHAIN ST
Now, the VOA Learning English program Words and Their Stories. For todays program, we go into the kitchen! There is a good chance you do not go one day without using a knife. It is an important tool when cooking, and without it, you could not make ma
One of the highlights of the plan to revitalize China's northeast is a scheme to transform the region into a manufacturing base for advanced equipment by 2030. Encouraging innovation and entrepreneurship will be crucial to make such a breakthrough. C