第三人称复数：lacunae
1. 腔隙：蛭类的次生体腔多退化,大多数由于肌肉、间质或葡萄状组织(botryoidalis tissue)的扩大而缩小形成一系列腔隙(lacuna). 棘蛭目较原始,次生体腔发达,血管系统存在,为闭管式,如寡毛纲一样.
2. 空白：lactation 生乳 | lacuna 空白 | lacuna of superego 超我缺陷
3. 缺失：barren bed 哑层 | lacuna 缺失 | hiatus 间断
4. 缺失;洼地：lacullan 黑沥青灰岩 | lacuna 缺失;洼地 | lacunae lacuna的复数
1. （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.
e.g. There are still major lacunae in the material available.
手边的材料依然存在严重缺漏。
1. The lacuna is in the lack of political will to fight it tooth and nail.
2. Chuang said there was lacuna in the law concerning the Village Representatives and Rural Committees elections.
3. Yet, the lacuna is that the current system fails to provide affordable services.
4. The lack of a specific provision prohibiting bad faith filings remains a lacuna in the law.