秦汉时期,有一部乐府诗集叫《饮马长城窟行》,主要记载了秦始皇修长城,强征大量男丁服役而造成妻离子散之情,且多为妻子思念丈夫的离情,其中有一首五言写道:“客从远方来,遗我双鲤鱼;呼儿烹鲤鱼,中有尺素书。长跪读素书,书中竟何如?上言长相思,下言加餐饭。”这首诗中的“双鲤鱼”,也不是真的\'指两条鲤鱼,而是指用两块板拼起来的一条木刻鲤鱼。在东汉蔡伦发明造纸术之前,没有现在的信封,写有书信的竹简、木牍或尺素是夹在两块木板里的,而这两块木板被刻成了鲤鱼的形状,便成了诗中的“双鲤鱼”了。两块鲤鱼形木板合在一起,用绳子在木板上的三道线槽内捆绕三圈,再穿过一个方孔缚住,在打结的地方用极细的粘土封好,然后在粘土上盖上玺印,就成了“封泥”,这样可以防止在送信途中信件被私拆。
How to prevent the H7N9?
As is well known,the A flu is spreading throught our country. However, if we negnect it, the deadly H7N9 may cause more infectors,or even more deaths. So what is the most important is that we should take some effective measures to prevent it.They can be listed as follows.
Firstly,it is necessary for you to realize the Avian flu can be prevented if you develop good living habits. For example,you shouldn’t forget to wash your hands before meals.Besides,don’t spit everywhere and try to cover your mouth or nose with paper or hankerchiefs when you have to cough or sneeze.What’s more, remember to wear the mouth-cover if you have to go to the public places, such as the crowded cinemas,supermarkets, buses,where the A flu may spread easily.
Secondly,of course, taking exercise more often and taking good sleep to build your body are wise choices for you to reduce the risk of being infected.
Last but not the least, if you are unlucky to be infected with the slight flu cold, try to stay at home,and take some medicine. Do pay attention to your daily body temperature. If you have a high fever, go to the hospital without delay for further treatment. Make sure you are not expected to come back to school before the cold or flu is cured.
Only by doing like this can you prevent or defeat the A flu in the end.
to prevent H7N9 we should know some common sense. First of all, it is important for us to prevent H7N9 from ourselves. For example, clean our hands frequently.
Sencondly, do more exercises. Such as running. Lastly, change our diet to keep balence. For example, eat more types of vegetables and drink more water
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