堤岸垮塌的抢险措施有哪些？
参考答案：
堤岸垮塌的抢险措施有增修后戗（有的称加筑附堤）、抢护毁坏前坡。
8的立方根是﹙ ﹚．
---This passage is difficult for me. Could you please explain it to me?
---I’m afraid I have to say sorry, but the book is ________ my understanding.
A．beyond
B．over
C．above
D．off
