Modern health and safety rules, for example, make it hard to run a scrap-metal business.
例如说，现代的健康与安全法规使得从事废旧金属回收不那么容易。
High quality hard metal can be prepared by simple breaking and grinding from hard metal scrap without any chemical treatment.
采用该法，只须采用破碎和细磨，不经任何化学处理，就能高质量地回收利用废硬质合金。
Looking at his beautiful creations, it is hard to imagine that all of them are made of scrap metal and abandoned materials.
亲眼看看他美丽的创作品，很难想像那些，都是用废弃的破铜烂铁所制成的。
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