开采量

Mechanized placer mining, with special devices for washing and separating waste from valuable minerals, is used in productive alluvial deposits.

机械化砂矿开采用于含矿量丰富的砂矿床。利用专门设备来淘洗、分离废物与有用矿物。

A proposal, now rejected, was made by a big ready-mix concrete company to mine over 20 km2 of sea bed off the New South Wales coast indicates the significance of the problem and the amount of environmental damage some are willing to incur to resolve it.

一项日后被否决的、由一家在新南威尔士滩外开采20平方公里以上海床的大型制造预混合混凝土的公司所提出的建议，说明了问题的显著性以及所发生的有些人试图缓解的环境破坏量。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。