:高二必修3英语Unit5知识点：Canada the true north

　　拓展：backward(s)向后 upward(s)向上 westward(s) adj./adv. 向西的，向西地

　　southward(s) adj./adv. 向南的，向南地 northward(s) adj./adv. 向北的，向北地

　　4. surround vt.&vi. 围绕; 包围

　　拓展：surrounding adj. 周围的 surroundings n. (常用复数) 周围的事物; 环境

　　be surrounded by / with 被……环绕着 surround ...with ... 使……包围

　　1) The house was surrounded by high walls.房子的四周有高墙。

　　2) We are living in pleasant surroundings. 我们生活在舒适的环境中。

　　3) As a child，I was surrounded by love and kindness.幼年时我备受关爱。

　　4) After being surrounded by the police for several days，the robber had to give in.

　　被警察包围几日后，抢匪不得不投降。