单靠人力不但效率低下，而且耗资巨大。

But relying on human are not only inefficient but also costly.

youdao

考虑到当前大量社区的人口管理尚处于手工作业阶段，不但效率低下，还常常因为管理的不慎而出现纰漏。

Taking into account the current population of a large number of community management is still in the stage of manual operation, not only inefficient, often because of careless management flaws.

youdao