Definition: to gradually become a large amount Level: C2
这周我的作业真的堆积如山了。
My homework is really ___mounting ___up this week.
我收件箱里未读的邮件正在快速累积。
The unread emails are really ___mounting ___up in my inbox.
随着截止日期临近，这项进行中的项目带来的压力开始与日俱增。
The stress from the ongoing project began to ___mount ___up as the deadline approached.
