N-COUNT

堡垒;要塞;防御工事

例句

n.

筑垒,设防

防御工事

Noun

1. defensive structure consisting of walls or mounds built around a stronghold to strengthen it

2. the art or science of strengthening defenses

3. the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)