驳岸
参考答案：
保护岸或堤，使不坍塌的建筑物，多用石块筑成。（驳岸是在水体边缘与陆地交界处，为稳固岸壁，保护河岸不被冲刷或水淹而设置的构筑物）
It was until last year that he ______.
A．left his home town for a new start
B．came to realize the importance of leaving English
C．worked as an English teacher at a middle school
D．set out to build a new house of h his own
内边界线
