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It has been proved, the bed material load, wash load and total load follow the same rule of carrying capacity.
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证实了床沙质、冲泻质与全沙具有统一的挟沙能力。 |
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It has been proven by instrumental analysis that metal oxides and salts disperse spontaneously to the pores and surface of zeolites at atomic level dispersion.
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摘要金属盐和氧化物在分子筛孔穴中及内外表面自发形成原子水平的分散，这种自发分散现象已被多种现代仪器分析所证实，并在国内外得到广泛认同。 |
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It has been pursued high quality since the company was founded in 1989,its products are sold well to 30 countries and areas, trusted deeply by all customers.
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公司自1989年成立以来，始终把质量放在首位，产品畅销海内外三十多个国家和地区，深得用户好评。 |
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It has been quite some time since we got together last. Tell me about your studies.
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自从上次相聚至今已有不少日子，告诉我你的学习情况。 |
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It has been raining all day.
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已经连续下一整天雨了。 |
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It has been raining for days on end.
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一连好几天连续下雨。 |
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It has been raining off and on since yesterday.
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从昨天起就断断续续的下着雨。 |
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It has been rather costly to install the machinery, but it should pay off in the long run.
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安装这些机器要花的钱相当多，但从长远来说是上算的。 |
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It has been rather disquieting these days.
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这几天心里颇不宁静。 |
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It has been received favorably in many markets abroad.
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海外市场很欢迎这个产品。 |
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It has been recognised, approved and praised several times by scholars and experts in the fields of medicine, physiology and physical education both in China and abroad.
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它已经认可,核准,并赞扬了几次专家和学者在该领域的医学,生理学和体育教育,无论在国内或国外. |
