n. 生计, 维持, 保持

vt. 保持, 保存, 遵守, 看守, 整理, 维持, 履行, 经营, 拘留, 记帐

vi. 保持, 继续不断

n. the main tower within the walls of a medieval castle or fortress

v. keep in a certain state, position, or activity; e.g., "keep clean"

v. retain possession of

v. look after; be the keeper of; have charge of