LAN (local area network) 局域网  例句：Aston University has installed a local area network (LAN) linking 2000 terminals. 阿斯顿大学已经建成了一个可以连接2,000个终端的局域网。into the blue消失得无影无踪  例句： At the bark of the dog, some birds stayed astonished, others disappeared into the blue.听到狗的叫声，有的鸟儿被惊呆了，其它的飞得无影无踪了。 Look before you leap.三思而后行对话：A: Dad, I want to marry Rose. B: Are you serious? Marriage is not a game. Look before you leap.A: I know. A：爸爸，我想和露丝结婚了。B：真的吗？婚姻可不是游戏，你要三思而后行啊。A：我知道。