The main gold bearing minerals include arsenopyrite, pyrrhotine, pyrite, galena and sphalerite.金矿的主要载金矿物分别为:毒砂 、 磁黄铁矿 、 黄铁矿 、 方铅矿和闪锌矿.Diethyldithiocarbamate was more better selective collector than Xanthate on galena.与黄药...
约翰逊医生和我一直试图增强他的体质。Dr. Johnson and I have been trying to build him up physically.她试图给他剪指甲，他不让。When she had attempted to cut his nails he resisted.我试图去够脚刹，但是没能踩到。I tried to reach the foot brakes but I couldn't....
be beleaguered with annoyance为烦恼所折磨The problems were an annoyance, but we managed to cope.这些问题很讨厌，但是我们都设法解决了。To her annoyance the stranger did not go away...让她恼火的是，那个陌生人并没有走。A dog that barks constantly can be a source of...