| If of expr * expr * expr (* if c then t else f *)
在诸多故乡中，台湾最让丘逢甲念念不忘。这片土地正遭侵占和掠夺，饱受苦难，而丘逢甲曾率台湾民众浴血抗日，以血肉之躯守护故土，那段抗争岁月，早已与这片土地的命运紧紧相融。内渡后的颠沛，未曾磨去他的家国之志，反而让这份情怀愈发宽广——他在潮汕兴学育人，培育爱国的少年英才；又远赴广州，投身孙中山先生领导的民主革命，以实际行动奔走呼号，为国家的觉醒与复兴倾尽全力。
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Consider what would happen if we really did delete the keys from the map, rather than leaving a tombstone. Here’s a playground where peers can add keys, but not delete them. Can you figure out how to get a peer to delete a key?
I remember sending my first email in the early 1990s, a clunky experience that meant logging on to two different computer systems. I thought it would never replace the much swifter fax. The internet was already revolutionizing the flow of information, and as editor of the Guardian’s gargantuan media section in the U.K. (printed every week with 50 pages of job ads), I was the proud owner of one of the first “WAP-enabled” mobile telephones. I mused in the front-cover headline whether this was “The End of Newspapers?”