The one American industry unaffected by the general depression of trade is the beamy industry. 美国工业中惟一未受贸易大萧条影响的是美容用品业。
The surface metallurgy technique which, by bombarding aluminium thin film deposited on the surface of high-speed steel ( W18Cr4V) with nitrogen ion beamy transformed the alloy compositions of the surface of high-speed steel has been described here. 本文介绍了用氮离子束轰击沉积在高速钢(W18Cr4V)表面上的铝膜,以改变高速钢表面合金成分的表面冶金技术;