晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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var isES5 = (function(){
    "use strict";
    return this === undefined;
})();

if (isES5) {
    module.exports = {
        freeze: Object.freeze,
        defineProperty: Object.defineProperty,
        getDescriptor: Object.getOwnPropertyDescriptor,
        keys: Object.keys,
        names: Object.getOwnPropertyNames,
        getPrototypeOf: Object.getPrototypeOf,
        isArray: Array.isArray,
        isES5: isES5,
        propertyIsWritable: function(obj, prop) {
            var descriptor = Object.getOwnPropertyDescriptor(obj, prop);
            return !!(!descriptor || descriptor.writable || descriptor.set);
        }
    };
} else {
    var has = {}.hasOwnProperty;
    var str = {}.toString;
    var proto = {}.constructor.prototype;

    var ObjectKeys = function (o) {
        var ret = [];
        for (var key in o) {
            if (has.call(o, key)) {
                ret.push(key);
            }
        }
        return ret;
    };

    var ObjectGetDescriptor = function(o, key) {
        return {value: o[key]};
    };

    var ObjectDefineProperty = function (o, key, desc) {
        o[key] = desc.value;
        return o;
    };

    var ObjectFreeze = function (obj) {
        return obj;
    };

    var ObjectGetPrototypeOf = function (obj) {
        try {
            return Object(obj).constructor.prototype;
        }
        catch (e) {
            return proto;
        }
    };

    var ArrayIsArray = function (obj) {
        try {
            return str.call(obj) === "[object Array]";
        }
        catch(e) {
            return false;
        }
    };

    module.exports = {
        isArray: ArrayIsArray,
        keys: ObjectKeys,
        names: ObjectKeys,
        defineProperty: ObjectDefineProperty,
        getDescriptor: ObjectGetDescriptor,
        freeze: ObjectFreeze,
        getPrototypeOf: ObjectGetPrototypeOf,
        isES5: isES5,
        propertyIsWritable: function() {
            return true;
        }
    };
}