披沙拣金的英文：
select the essentials from a mass of material
He is an experienced editor and knows how to get essentials from a large mass of materials.
他是位很有经验的编辑,知道如何披沙拣金。
v. 选择，选拔
adj. 精选的，优等的；有钱人使用的；苛责的，挑剔的，爱挑三拣四的
skirt selectivity
边缘选择性
Then you select the leader.
然后你们选出指挥。
These are selections from Faulkner.
这些是福克纳选集。
n. 精要
They are essentially in a triunity.
他们本质上是三位一体的。
Protein is essential to life.
蛋白质是生命必不可少的。
Coal is an essentially nonrenewable resource.
煤是不可再生资源。
n. 团，块，堆；大量；群众；大部分，主体
v. 集中，聚集
adj. 大众的；大规模的
a mass murderer
杀戮众多的人
stability of rock mass and soil mass surroundingunderground excavation
地下洞室围岩(土)稳定性
A mass or collection of material that is distinct from other masses.
和其它大多分开的一团和一堆物质。