accumulate

化学物质会在你的体内积聚。

The chemicals ___accumulate in your body.

灰尘会在不经常打扫的角落慢慢堆积。

Dust tends to ___accumulate in corners that aren't cleaned regularly.

灰尘在书架上不断堆积，需要定期清理。

Dust continues to ___accumulate on the bookshelf, requiring regular cleaning.