In his search the scientist accumulates much background information .

科学家在搜索中积累了大量的背景信息。

Persistent , toxic and accumulates in human bodies .

在人体内有持久性,毒性和累积性。

Mercury accumulates as it works its way up the food chain .

汞会随着食物链上的食物传递而积聚。

Dust soon accumulates in the room .

房间里很快积满了灰尘。

Dust soon accumulates if we don 't sweep our rooms .

如果我们不打扫房间，灰尘很快就会堆积起来。