N-COUNT (文件、论点等中对重要问题的)缺漏,脱漏,遗缺 If you say that there is a lacuna in something such as a document or a person's argument, you mean that it does not deal with an important issue and is therefore not effective or convincing. (文件、论点等中对重要问题的)缺漏,脱漏,遗缺 [formal]
There are still major lacunae in the material available.