这个项目失败了，纯粹是因为任务极其复杂。

The project failed due to the ___sheer complexity of the tasks.

沙漠夜空中可见的星星数量之多，令我们惊叹。

We were amazed by the ___sheer number of stars visible in the desert sky.

每天处理的数据量之大令人震惊。

The ___sheer amount of data processed daily is staggering.