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最佳答案：Water is a necessity of human life.
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最佳答案：要成为成功的销售人员有些素质必不可少Certain qualifications are indispensible for a successful sale
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最佳答案：I am not essential for you， but you are indispensable for me.
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最佳答案：Computers fastened the development of society, it allowed the distance between p
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最佳答案：Temple fair is an essential cultural activity during the Spring Festival.We cann
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最佳答案：In the international economic and trade activities, commercial contract is an im