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    邓艾字士载,义阳棘阳人也。少孤,太祖破荆州,徙汝南,为农民养犊。年十二,随母至颖川。读故太丘长陈寔碑文,言“文为世范,行为士则”,艾遂自范,士则。后宗族有与同者,故改焉。为都尉学士,以口吃,不得作干佐,为稻田守丛草吏。同郡吏父怜其家贫,资给甚厚,艾初不稍谢。每见高山大泽,辄规度指画军营处所,时人多笑焉。后为典农纲纪、上计吏,诣太尉司马宣王,宣王奇之,辟之为,迁尚书郎。

    出参征西军事,南安太守。嘉平元年,与征西将军郭淮拒蜀偏将军姜维。维退,淮因西击羌。艾曰:“贼去未远,或能复还,宜分诸军以备不虞。”于是留艾屯白水北。三日,维遣廖化自白水南向艾结营。艾谓诸将曰:“维今卒还吾军人少法当来渡而不作桥此维使化持吾令不得还维必自东袭取洮城。”洮城在水北,去艾屯六十里,艾即夜潜军径到,维果来渡,而艾先至,据城,得以不败。赐爵关内侯,加讨寇将军,后迁城阳太守。

    景元四年冬十月,艾自阴平道行无人之地七百余里,凿山通道,造作桥阁。山高谷深,至为艰险,又粮运将匮,频于危殆。艾以毡自裹,推转而下。将士皆攀木缘崖,鱼贯而进。先登至江由,蜀守将马邈降。蜀卫将军诸葛瞻自涪还绵竹,列陈待艾。艾遣子忠等出其右,司马师纂等出其左。忠、纂战不利,并退还,曰:“贼未可击。”艾怒曰:“存亡之分,在此一举,何不可之有?”乃叱忠、纂等,将斩之。忠、纂驰还更战,大破之,斩瞻及尚书张遵等首,进军到雒。刘禅遣使奉皇帝玺绶,为笺诣艾请降。

    艾至成都,检御将士,无所虏略,绥纳降附,使复旧业,蜀人称焉。

——节选自《三国志·魏书》

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    Each summer,you hear news that some sports players are sent to hospitals because it is too hot. Our bodies can't be outside in the sun for a long time. So in hot summers,be careful about playing sports outside.

    Firstly,to play sports safely in hot weather,you must drink water. Sports drinks are great for athletes,but they have so much sugar that they'll dehydrate(使脱水)you more. However,drinking a few bottles of sports drinks will be good for you.

    Secondly,be sure to take enough breaks to let your body rest. If your coach doesn't let you take enough breaks in the heat,don't wait until you feel uncomfortable. Just be honest with your coach when you need breaks.

    Thirdly,when you have a break,don't sit in the sun. With the sun beating down on you,you'll only heat up and sweat(冒汗)more. Take a seat under a tree,or even better,go indoors for a little while. Cooling yourself down can help you stay active longer.

    Fourthly,remember that the earlier in the day you start your exercise,the cooler it will be. If you can start practice before the sun comes up,you have a few good hours to practise in the cool hours of the morning. Also,the earlier you practise,the earlier you can finish the exercise. If you need more practice time,come back to the field later in the evening,when the sun is setting.

    Last but not least,you should watch what you eat. Eat food which is high in water,starch(淀粉)and carbonhydrate(糖类),but be sure to get a good balance in your diet.

    As long as you pay attention to the above,playing sports safely in the heat isn't a difficult thing.