By analyzing the technical flow of pithead heap-leaching uranium deposits of hard-rock type, the authors analyze its 14 cost items such as ore mining fee and major materials fee etc.

通过对硬岩型铀矿坑口堆浸法的工艺流程分析，总结出坑口堆浸成本由矿石开采费用、主要原材料费用等14项要素组成，并建立了地质经济评价模型。

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The paper described the method of making diazomethane and its corresponding apparatus by using common items in the lab. All the required materials were low cost and easy to obtain.

文章介绍了利用实验室常见物品制作简易重氮甲烷发生和反应装置的步骤。

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Although the sums involved are very small in terms of its annual turnover, the Royal Mail says the proceeds are used to recoup part of the cost of its National Return Letter Centre based in Belfast, which aims to return undeliverable items to the sender wherever possible.

BBC: How much does Royal Mail make from undelivered parcels?