1，数学上的那个充分必要条件的 必要性英语怎么说

necessity
necessity [英] [ni?sesiti] [美] [n??s?s?ti] 必要(性)
necesarity 感谢采纳

数学上的那个充分必要条件的 必要性英语怎么说

2，请翻译成英文

The need for Americans to drive the story in English: catch up from behind the origin of the foreign customs Fool English Humor English Rao Password: miser guests

请翻译成英文

3，根据下面的提示写一篇发言稿说明学好英语的必要性字数100字

Mrs Wilson, Im going out shopping, and wont be back until about 5:00 pm. I have taken with me the two books you asked me to return to the City Library. At about 1 oclock this afternoon, Tracy called, saying that she couldnt meet you at Bolton Coffee tomorrow morning as she has something important to attend to. She felt very sorry about that, but said that you could set some other time for the meeting. She wanted you to call her back as soon as you are home. She has already told Susan about this change. Li Hua
我不会~~~但还是要微笑~~~：）

根据下面的提示写一篇发言稿说明学好英语的必要性字数100字

4，求博物馆存在的必要性英语作文

During a long vacation,I usually like to go to see the exhibits in one of a great many museums.Such as the art museum,the history museum,the museum of natural history,and the museum of science and technology.Many wonderful things are cared for in museums.There are paintings,potteries,sculptures,costumes,swords,ancient animal bones and plants,stuffed animals,antique steam locomotives,and many others
during a long vacation, i usually like to go to see the exhibits in one of a great many museums. such as the art museum, the history museum, the museum of natural history, and the museum of science and technology. many wonderful things are cared for in museums. there are paintings, potteries, sculptures, costumes, swords, ancient animal bones and plants, stuffed animals, antique steam locomotives, and many others. it is always a good review of history to visit those museums.

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