Leftover food and unwashed dishes cover the dirty counters.

剩饭和没洗的盘子铺满了肮脏的台面。

《柯林斯英汉双解大词典》

Besides, after they achieved their 'developed' status, they tried to cover up their dirty past by accusing other countries of 'stealing, …. etc'.

再者，在他们达到所谓发达状态时，他们试图通过谴责他国盗取技术来掩盖他们的肮脏过去。

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Examine the pressure meter tube and valve, pressure meter cover glass, if it is dirty, clean it with diluted hydrochloric acid.

检查压力表管道及阀门是否畅通，灵活，压力表面玻璃如有污，可用稀盐酸拭净。

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There was a brief moment of collective panic around Memorial Day in late May, after the federal government started sharing its fears that terrorists might target cities with weapons of mass destruction and the New York Times Magazine ran a cover story exploring what might happen if a dirty nuclear bomb went off in Times Square.

ECONOMIST: New York city one year on

Each photograph is accompanied by observant notes putting the image in cultural and historical context, each section--divided by region--is bolstered with histories, journal entries and a secondary travel narrative: Dutertre getting his camera equipment confiscated in China, or Japanese shopkeepers insisting the dirty American tourists--Dutertre and his ilk--cover their shoes in "over-slippers" before entering their pristine stores.

FORBES: Magazine Article