Definition
To be far from satisfactory; to have significant room for improvement.
令人失望
The service at this restaurant really leaves a lot to be desired.
这家餐厅的服务真的有很大的改进空间。
The progress of this project still leaves a lot to be desired, we need to speed things up.
这个项目的进度仍然有很大的改进空间，我们需要加快速度。
The content and data analysis of this report leave a lot to be desired.
这份报告的内容和数据分析有很大的改进空间。