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They contain nitrogen and usually occur as salts of asids such as citric, malic, and succinic acids such as citric, malic, and succinic acids.
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它们是一类含氮的，一般由酸性盐如柠檬酸，苹果酸，琥珀酸所形成。 |
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They contain nonheme iron in association with sulfur at the active site.
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它们含有非血红素铁，在活性位点与硫协同作用。 |
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They contain rich volcanic rocks and minerals by which reliable iso-chronic data can be got, possess successive sandstone and mudstone by which accurate magneto-stratigraphic columns can be set up and distinguish geological events, and also contain a larg
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与海相地层比较，陆相地层在同位素测年、磁性地层划分和事件地层学研究方面具备建立层型的优势，同样可以找到分布广泛和利于大范围地层对比的化石门类。 |
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They contain the history of our race, the discoveries we have made, the accumulated knowledge and experience of ages; they picture for us the marvels and beauties of nature, help us in our difficulties, comfort us in sorrow and in suffering, change hours
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书籍记录了我们人类的历史，记录了我们的新发现，也记录了我们世世代代积累的知识和经验：书籍为我们描绘了自然界的奇观和美景；书籍帮助我们摆脱困境，在我们悲哀困苦的时候，给我们以安慰，在我们烦闷的时刻带来欢乐，给我们的头脑装进各种观念，使我们的脑海充满了美妙高尚的思想，从而使我们超越自我，高于自我。 |
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They continue to drive down expenses to lower the already cheap price of $1 to $3.
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目前马达只要1~3美元，但他们仍努力要将价格再压低。 |
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They continue to excite the imagination and are probably the most famous aromatics of all time.
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它们持续地刺激着想象力，很可能是所有时期中最芬芳的时期。 |
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They continued down until they came to some pockets of natural gas.
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他们继续往下钻, 终於找到了一些天然气的气阱. |
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They continued down until they came to some pockets of natural gas.
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他们继续往下钻,终于找到了一些天然气的气阱. |
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They continued for nearly 12 centuries, until Emperor Theodosius decreed, in 393 AD, that all such 'pagan cults' be banned.
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这样持续了近12个世纪，直到西奥多斯大帝在公元393年颁布法令，取缔所有“异教徒”。 |
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They continued getting their knives ready as the water to boil the dog heated up.
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煮狗的水热起来之后，他们继续磨刀。 |
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They continued the walking in silence.
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他们继续静静地前行。 |
