drops behind短语¹⁴⁴⁹⁷²⁺² 基本例句 na.落在后头；同“drop back ” The test- bed is designed for the inspection of new plane hydraulic system and improves the old one's disadvantage such as that the technology level drops behind and the inspection efficiency is low. 飞机液压附件综合试验台是针对目前装备使用试验台技术水平落后、设计效率低下等问题和满足我国引进新一代先进飞机液压系统检测需求设计而成。 www.jxcad.com.cn