以下为句子列表：
英文: Genetic engineers have spent 20 years trying to create a type of yeast that can ferment xylose on an industrial scale. So far, they've failed.
中文: 基因工程师已花费二十年时间来尝试制作一种酵母，它能在工业规模上使木糖发酵。但至今为止，他们并未成功。
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英文: And the ratio of arabinose to xylose was 0.7.Concentration of β-glucan,mannose and galactose in SDF was .0%,.%and . %respectively.
中文: 提取的SDF中还含有.0%的β-葡聚糖、.%甘露糖和 . %半乳糖。
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英文: Based on spectral IR,MS, H NMR, C NMR and physico chemical constant analysis,they were identified as 7 epi taxol B (Ⅰ),, diacetoxy 0 deacetyl baccatin Ⅲ (Ⅱ), taxol C 7 xylose (Ⅲ),taxol (Ⅳ), epi ursolic acid (Ⅴ).
中文: 通过理化常数及IR、MS、H－NMR、 C－NMR分析，鉴定为7－表－紫杉醇B（Ⅰ）、， －二乙酰基－0－去乙酰基巴卡亭Ⅲ（Ⅱ）、紫杉醇C－7－木糖甙（Ⅲ）、紫杉醇（Ⅳ）和 －表－熊果酸（Ⅴ）。
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英文: HPT and HPT are all composed of Glucose, Mannose and Xylose by analysis of gas chromatography, and their molar ratios are 00∶0 7∶0 and 00∶0 ∶0 for HPT and HPT respectively.
中文: 其摩尔比HPT为 0 0∶0 7∶0 ,HPT为 0 0∶0 ∶0 。
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英文: analysis indicated that it contained glucose (Glc), xylose (Xyl) and galactose (Gal), and its molar ratio is 7.0: .7: .00. The crude polysaccharide has been fractionated by ethanol.
中文: 分析表明其单糖组成为Glc、Xyl、Gal，摩尔比为7.0： .7：.00。
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