第三人称单数：lacunae
名词腔隙; 缺陷; 空白; 空隙
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。