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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；

also

adv. 也，同样，并且；conj. 另外；

impede

vt. 阻碍，妨碍，阻止；

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]；

sand

n. 沙，沙滩，沙色；vt. 撒沙于，用砂纸磨光；
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