accumulate

Dust will quickly accumulate on the bookshelves if you don't clean them at least once a week.

(Chinese) 如果你不每周至少打扫一次，书架上很快就会积起灰尘。

The central bank continued to accumulate gold reserves to stabilize the national currency.

(Chinese) 中央银行继续积累黄金储备以稳定本国货币。