erode

竞争可能逐渐削弱孩子的信心。

Competition can ___erode a child's confidence.

暴雨能迅速侵蚀河岸。

Heavy rains can quickly ___erode the banks of a river.

酸雨会随着时间的推移侵蚀古老的石制纪念碑。

Acid rain can ___erode ancient stone monuments over time.