It was a hard-swept looking little house with hard-polished Windows, and a clean mud-mat on the front steps.

看得出这座不大的屋子好好打扫过，窗户也曾细心地擦拭过，就连前面台阶上的擦鞋垫都收拾得干干净净。

youdao

Such as sand not clean (mud high content), sand the fineness modulus too high or too low, also can make the strength of concrete is reduced, and the water increased.

如砂石不干净(泥含量较大)、砂的细度模数过高或过低等，也会使混凝土强度降低、泌水性增加。

youdao

Sediment transport may not pump more water or mud. Flooding electric motor cavity should always clean up the sand, the replacement of electric water cavity.

电泵不得输送含沙量较多的水或泥浆。水浸电机应经常清理电机腔内的沙粒，更换电机腔内的清水。

youdao

Dozens of suburbs were submerged and residents are continuing to clean up swathes of mud and debris.

BBC: Australia floods: Queensland launches inquiry

It took a long time to clean up our classrooms especially the vinyl mats that we had to scrub the mud, dry them outside and roll them out again in our classes.

UNESCO: The REAP Report: Our Educational Environment

We weren't there, we were brought in to clean up this newspaper, with a new editor who is beyond reproach, but the mud was sticking on us.

BBC: News of the World staff shocked at closure