他带他们走过一条过道，地上铺着柔软的地毯，墙上糊着奶油色的墙纸，嵌壁漆成白色，一切都是一尘不染，十分清洁。
The passage down which he led them was softly carpeted, with cream-papered walls and white wainscoting, all exquisitely clean.
洗好的衬底需要有简单而快速的检验方法，因为在普通室内光线照射下几乎所有很好清洗过的衬底看起来都是十分清洁无瑕。
A simple and quick inspection method is now needed, since almost any well washed slide appears immaculately clean under normal room light.
必须注意，首先要保证焊接头表面十分清洁，因为污物会减弱焊缝的强度。
Care must be taken to ensure that the surfaces are thoroughly clean first, for dirt will weaken the weld.
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