British & Australian
if things or people are thin on the ground, there are not many of them.
Bears are getting rather thin on the ground in European forests.
I get the impression work is a bit thin on the ground at the moment.
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。