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。 

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