inroad

词源记忆法

in-，进入，使，road，古义，骑马，侵袭，词源同ride，raid.其原义为恶意入侵，侵扰，后词义褒义化指进展。

习语积累

习语 n. make inroads into/on sth 消耗，削弱，影响（某事物） if one thing makes inroads into another, it has a noticeable effect on the second thing, especially by reducing it, or influencing it Tax rises have made some inroads into the country's national debt. 增加税收已使国债有所减少。