The diagram shows the life cycle of silkworms and the process of making silk cloth.
The life cycle is divided into several particular developing stages. It starts when a moth produces her eggs on the mulberry leaves. After ten days the eggs grow into silkworm larva, whose foods are the mulberry leaf. The second stage ends. In the following four to six weeks, the larva will generate silk threats which cover the larva. This is the third stage. The fourth stage lasts for three or eight days during which cocoon is formed. 16 days after the formation of the cocoon, a moth finally comes out of the cocoon. A new cycle starts.
The production of the silk cloth consists of numerous steps. The first is to select cocoons, which then are heated in boiled water. After the heat treatment, the cocoon is ready to be decomposed into threads ranging from 300 to 900 meters in length. The second is to twist the thread together. To dye is the third. After this process, silk cloth is woven.
Words to Live by 1
I will greet this day with love 1
The Gift of Love
山寨也能成大器
The beautiful sound of violin
东盟秘书长:南海可能成为“巴勒斯坦”
资源民族主义引发担忧
Where Are We Heading
做空日本时机已到?
FT社评:安倍晋三归来
中移动将销售诺基亚新款智能手机
微笑的妙处
朝鲜的非法武器贸易
巴勒斯坦获得联合国观察员国地位
Are you happy?
瑞银挨的“板子”太轻
埃及总统穆尔西将对全国发表讲话
印尼体育部长受腐败调查影响辞职
快唤醒你的生活
The road of life
周大福业绩大幅下滑
法国奢侈品公司PPR计划收购麒麟珠宝
维系永恒的婚姻与爱情
Every Woman is beautiful
A Miracle of Tears
金砖国家的微观缺陷
世人纪念美国总统肯尼迪遇刺49周年
从现在开始,多想想你拥有的
比金钱更重要的
风暴之后
| 不限 |
| 英语教案 |
| 英语课件 |
| 英语试题 |
| 不限 |
| 不限 |
| 上册 |
| 下册 |
| 不限 |