A huge backlog of work had built up.

一大堆工作积来。

Investment is needed to reduce the backlog of repairs.

需要投资来減轻积的维修工作。

After her summer vacation,she has got a huge backlog of work to do.

暑假休假以后,她手头有许多积的工作要做。

It will take a month to clear the backlog of work.

要花一个月的时间才能清理完积的工作。