1. Even these hard parts may crumble to dust.
    甚至这些坚硬的部分也会破碎成粉末。

2. Brass is an alloy of copper and zinc.
    黄铜是铜和锌的合金.

3. But scientists are working hard to turn them into realities.
    但是, 科学家们正在努力工作, 以便把想法变成现实.

4. But Hunter worked so hard that he overstrained his heart.
    但是，亨特工作十分刻苦以致心脏过于劳累。

5. But she had had a hard life and it had knocked the youth and good looks out of her.
    但是她曾经过着很艰辛的生活，这种生活使她失去了青春和美貌。

6. We make good use of special plastics in place of alloy.
    我们充分利用特种塑料来代替合金。

7. We sought long and hard but found no answer.
    我们费力多时也未找到答案.

8. We tugged so hard that the rope broke.
    我们一用力把绳子给拉断了.

9. It pleasant to escape to a time when life,though hard, was relatively simple.
    逃到一个即使艰苦但比较简朴的时代中去是件愉快的事，

10. Whether the remarkable growth of organized camping means the eventual death of the more independent kind is hard to say.
    有组织的露营活动的明显发展是否意味着较独立的自我封闭式露营的最终消失，还很难说。

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