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They also impede backmixing of sand.是什么意思？

They also impede backmixing of sand.

同时也可防止砂子的返混.

相关词汇
they also impede of sand

they

pron. 他/她/它们，人们，大家，政府，当局，她们；
例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

also

adv. 也，同样，并且；conj. 另外；
例句
The media have also abetted the feeling of unreality.
媒体也在一旁对这种非现实感推波助澜。

impede

vt. 阻碍，妨碍，阻止；
例句
At no time did I make an attempt to impede any investigatory effort.
我绝没有试图妨碍过任何调查工作。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

sand

n. 沙，沙滩，沙色；vt. 撒沙于，用砂纸磨光；
例句
... the mile of white sand beach bordered by palm trees and tropical flowers
四周种有棕榈树和热带花卉的长达1英里的白色沙滩
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
After three days without food, the men were close to starvation.
3 天没吃东西，这些人都快饿死了。
The air was heady with the perfume from roses.
空气中玫瑰花的香味令人陶醉。
"Could he be suffering from amnesia?" I suggested.
“他是不是患了健忘症？”我试探着问道。
Her comments still rankled.
她的评价仍然让人耿耿于怀。
His marriage was going through a bad patch...
他的婚姻当时麻烦不断。
What did the tenants expect if they could only afford to rent such wretched hovels?
他们那点钱,只能租这样的屋子;破,危险,都活该!
How many judges in our male-dominated courts are sensitized to women's issues?
在男性占主导地位的法庭上，有多少法官对妇女问题是比较敏感的呢？
He wants all of us to sign.
他要我们大家都签字。
East, west, home is best.
金窝银窝，不如自己的草窝
He advised going slowly.
他建议走慢点。