n. 隧道, 地下道vi. 挖隧道vt. 掘隧道于【医】 隧道

◆记忆方法一：
联想方式：tun吨；nel闹铃
记忆方法：一吨的闹铃摆在隧道口
◆记忆方法二：
词根词缀记忆法：tunnel n 隧道（tunn管道+el）,-el表名词，“人 或物”

canal/channel/strait/tunnel/cave
记忆：
1. canal [ kE5nAl ] An artificial waterway or artificially improved river used for travel, shipping, or irrigation. n. 运河, 沟渠 The Jiang-Hang Canal played a very important part in the national economy at that time. 那时候京杭大运河在国民经济中起着重要作用。
2. channel [ 5tFAnl ] n. 海峡, 水道, 频道 The English Channel lies between England and France. 英吉利海峡位于英法之间。
3. strait [ streit ] A narrow channel joining two larger bodies of water. n. 海峡 The people across the straits call for peace and unity. 海峡两岸的人呼唤和平与统一。
4. tunnel [ 5tQnl ] An underground or underwater passage. n. 隧道, 地道 A tunnel is to be dug through the hill in two months. 两个月后人们将挖条隧道穿过小山。
5. cave [ keiv ] A hollow or natural passage under or into the earth with an opening to the surface. n. 洞穴, 窑洞 The huge natural cave has been exploited into a tourist attraction.那个巨大的天然洞穴已被开发为一个旅游亮点。
另类阅读：
The programs on Channel 5 will take you to the Suez Canal, English Channel and Taiwan Straits. It will also take you to some famous caves and tunnels in China.