万里长城是世界古代建筑的奇迹。早在春秋时期,楚国就修筑了长数百千米的非封闭性城墙,叫作方城。战国时,燕、赵、魏、韩、秦等都在边界筑起了长城。秦始皇统一天下后,把燕、赵、秦原有的北方长城连接起来,筑成西起临洮东至辽东的长城,长万余里。今山西大同北部,甘肃岷县城西等地均有秦长城遗址。
西汉沿河西走廊一带向西增筑朔方长城和河西长城,经玉门关延伸到今新疆境内,以保护河西走廊。北魏时西部柔然人满为患,又兴筑长城以防柔然人南侵。北齐也多次修筑长城。隋代为防御突厥、吐谷浑,数度修筑长城。明朝建立后,大将徐达曾18次在居庸关修筑长城。明长城西起甘肃嘉峪关,东至鸭绿江,这就是今天我们见到的万里长城。
明长城主体是城墙。山西东面至山海关一段,断面下宽上狭,平均底宽6米,高逾6.5米,外砌整齐条石和特大城砖,内部夯土。城墙顶部用三、四层砖铺砌,最上一层是方砖,用石灰勾缝,十分平正坚实,连野草也难以生根,平均宽5米,可容5马
并骑10人并进。墙顶两侧还砌有砖墙,内侧砌成约高1.5米的矮墙,外侧砌成约高1.5米的垛墙,每一垛牙上面有了望孔,下面有一射击眼。城墙上有排水沟、吐水嘴等设施,在关口和险要的地方还设有凸出的罗城。
修筑长城的工程浩大,筑长城所用土方如所来筑一道厚1米、高5米的墙,可绕地球一周有余。筑长城一般就地取材,大型城砖和石灰是就地烧制的。在高山峻岭,则开采石料,用石砌筑。在沙漠中,用红柳枝条和芦苇与砂石层层相间铺砌,可砌到6.5米以上。在黄土地区,大都取土垒筑,在重要地段的城墙一般用砖砌和条石镶砌
我的家乡在江南,是一个鱼米之乡。
我的家乡有一个美丽的旅游胜地,名叫香湖岛。春天的香湖岛是一个生机勃勃的地方,夏天的香湖岛是一个热闹非凡的地方,秋天的香湖岛是一个落叶缤纷的地方,冬天的香湖岛是一个白雪飘飘的地方。这就是香湖岛一年四季的情景。
我家乡的香湖岛,春天的香湖岛一片五彩缤纷,那到处鸟语花香、生机勃勃的。夏天的香湖岛那里面一片人山人海,到处都是游客,游客多的.都快要堵塞交通了。我们在这些游客之间穿梭,我差一点点被游客拥挤的都喘不过气来了。那里的九曲桥上也都挤满了人,我们连上也上不去,更别说在上面欣赏美丽的香湖岛景色了,我们只好耐心的等待旅客散去后才能再上去欣赏美丽的风景了。在一个小亭子里,看到了四个小凳子,但是好做了八个人呢,其中有四个妇女,一个妇女抱着一个小孩子,四个妇女一共抱了四个小孩子,只有这一个地方不是那么拥挤的。
在我们先进来走不久的地方有很多大大小小、各种颜色很美丽的荷花。有红色的,像被红色的染料染过一样;有黄色的,像被黄色的油漆漆过一样;还有白色的荷花,像冬天里的雪一样雪白。秋天的香湖岛哪里面一片黄色的情景,遍地都是黄色的落叶,,像是给地上铺盖了一层黄色的地毯。冬天的香湖岛那里一片白色的情景,一片白色的大雪,像是给香湖岛铺上了一层白色的棉絮。在我们离开的道路旁边有很多小的蘑菇形状的垃圾桶。
我们离开的大门旁边有一块非常大的石头,上面雕刻了三个大字:“香湖岛”并且涂上了非常鲜艳的红颜色,非常醒目耀眼。我恋恋不舍的离开了这美丽的香湖岛。每天晚上,我都会梦到,我么以前去美丽的香湖岛游玩的情景,真美丽啊!
慕田峪长城位于北京市东北隅的怀柔县境内,距北京城73公里。此段长城西接北京昌平县的居庸关,东连北京密云县的古北口,自古以来就是拱卫北京的军事要冲,被称为“危岭雄关”。早在1400多年前的北齐,就在慕田峪筑有长城。明朝初年重建,明永乐二年(公元1404年建“慕田峪关”。隆庆三年(公元1569年,谭伦、戚继光镇守京畿时,又在明初长城的基础上加以修葺。现在慕田峪所保留修复的长城,为明代所修筑,是全国明代长城遗迹中保存最好的地段之一。
慕田峪由于地理位置十分重要,在此曾发生过多次战事。其中最著名的是明代的几次战争,明初徐达和元兵也曾大战于此。慕田峪长城多建在外侧陡峭的崖边,依山就势,以险制厄。墙体高七八米,墙顶宽四五米,建筑材料以花岗条石为主,雄伟坚固。慕田峪长城,墙顶上两边都建有矮墙垛口,可两面拒敌,外侧还挖掘有挡马坑,使防御功能更加完善,这是一大特点。
爸爸妈妈终于抽出空来陪我去太极洞旅游,我开心极了。
太极洞位于安徽省广德县境内的石龙山,是国家aaaa级旅游胜地,分为水洞和旱洞,形状似太极图标,所以叫太极洞。据说,太极洞也是道家先发现的呢。
旱洞的景点有“仙舟覆挂”、“千年古槐”、“水滴石穿”等。我对“水滴石穿”最感兴趣,滴水的力量可真大呀!
乘小舟徜徉在水洞,在五色灯光的照耀下,奇石碧玉,似群星闪烁,我们好象是在银河中旅行。水洞之中,又分五层洞,著名的景点有“金龙盘柱”、“洞中黄山”、“龟蛇竞寿”等,我们都一一合影留念。特别是有一处洞中,有牌子介绍洞顶洞底相差“上下五亿年”,大自然的鬼斧神工,令人惊叹。
三个多小时的旅行结束了,我们踏上归途,但是,我对太极洞的美景久久不能忘怀。
响水湖长城位于怀柔慕田峪西部,距北京78公里,总占地面积18平方公里,是集长城、古洞、山川、泉潭、飞瀑于一体的天然锦绣谷,响水湖并不是一片很大的水域,而是在泉水的源头,泉涌如注,千米之外便可听到泉水的响声,系怀柔第一大泉,故得名"响水湖"。
金秋的响水湖长城秋高气爽,红叶满山,昔日长城内外郁郁葱葱的绿,如今已成片片红叶,把这大山装扮得如此美丽,在秋风微微吹动下,像一个青春少女穿着色彩斑斓的裙服在翩翩起舞。
而更引人注目的是景区内占地面积1700余亩、年产水果20余万斤的果园,果园内硕果累累,坠满枝头,品种有:苹果、红果、山栆、梨、核桃、板栗、山葡萄、山花椒、山野菜等品种,目前正值丰收季节,响水湖长城为感谢各界人士的厚爱,愿把这丰收喜悦与您一起分享,定于8月25日至10月底在景区举办"庆金秋、游美景、送采摘"活动。活动期间,游客购买门票进入景区游览,同时您可凭门票领取专用提袋,到景区指定的果园免费采摘时令水果,您也可在果园内先尝为快,然后带回去一袋,让您的朋友也一饱口福。请即刻行动吧!带上您的家人和朋友一起到响水湖长城当一天果民、亲身体验一次丰收的.喜悦!
I have a great mother. She cares much about me in my life and study.
In the morning, she gets up early to make breakfast for me. When I was little, she prepared my schoolbag. But now, she tells me to do it by myself. Because she thinks I have been old enough to do it. Besides, she always checks my homework. When I finish my homework, she checks it and points out the mistakes. She is very careful and helps me a lot.
I love my mother.
My mother
My mother is very kind and beautiful although she is not tall.She is 42 years old this year.She is a nurse,so she is always very busy day and night.But she loves her job,and she often takes care of her patients.Of course,she also likes singing,dancing,cooking and shopping,but she almost no time to do them.
Oh,I love my mother.
描写妈妈的英语作文:
November **, ****
To Whom It May Concern:
This is to confirm that Mr. Li Dashui has worked as a full-time system analyst in the NY University since Jun 1994(or This letter is to verify that Mr. Li Dashui worked as an chemist from July 1993 to Sept. 1994. Mr. Lis main duties and responsibilities are as follows:
Design, develop and install various computer hardware, software and network systems for banks.
Determine and analyze the requirements of each system project into related componets solved through the application of computer technology.
Write specifications for computer programs, and test and implement programs for network systems and control systems.
Supervise computer programmers and other system analysts for paticular system projects.
Mr. Li has mainly taken part in the following projects:
The first engineering design of city general business computer network system.
Upgrading banks system for IBM AS/400 E45 to IBM AS/400 320, IBM AS/400 530.
The design development and test of city general business computer network system.
The design and development network and database systems for the Golden Credit Card Project.
Mr. Li is well experienced with IBM AS/400 system analysis, TCP/IP protocol, SNA protocol and LAN; proficient in RPGIII, VB, C/C++ and DB2, and skilled in UNIX, Informix, Client/Server etc.
Mr. Li is a hard-working and talented analyst, and is highly respected member in our company. If you need further information, please feel free to contact me. Sincerely yours, Singature, Zhang Jianguo
Senior Engineer and Technical Manage Company Name, Address, Tex Fax
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