保持: (维持; 使不消失或减弱) keep; hold; retain; maintain; preserve 短语和例子保持安静 keep quiet; 保持优势 hold on to a dominant [favorable] position; 保持警惕 maintain vigilance; be on the alert; 保持清洁 keep clean; 保持优良传
阶段: stage; phase; period; gradation; bench 短语和例子分阶段 by stages; in stages; 分阶段撤军 phased troop withdrawal; 过渡阶段 transitional stage; 历史阶段 historical period; 初 [中; 高]级阶段 the junior [middle; senior
