大型火力发电厂在生产运行过程中产生大量的粉煤灰，长期积存堆放，污染环境、占用土地。

In Production process of large scale power plant, coal fly ash is produced in large amounts. These coal fly ash is piled up. It pollute the environment, wasting the cultivated land.

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虽然氯联苯没有很强的直接制毒性，但是它们能长期存留在环境中，并积存在人体组织里。

Although PCBs have a low immediate toxicity, they are very persistent in the environment and accumulate in tissues over time.

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汽车经过长期的使用后，顶棚这个往往在不起眼的地方积存了很多的灰尘，这些地方往往也是日常清理照顾不到的地方。

The car after a long-term use, often in the ceiling of this inconspicuous place accumulated a lot of dust, which is often the daily cleaning, take care of the place.

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