He is good at reading and writing, but he wishes he knew how to understand and speak better.
他的阅读和写作是强项,但他希望知道怎样去理解和说得更好。
Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come back.
大家都知道,在墙壁或山腰附近发出的喊声,就会听到回声。