The contract is part of a conversion program aimed at rebuilding four single-seat L-159s into two-seat trainer versions.

该合同属于转换计划的一部分，此计划目的是将4个单座l - 159重建成双座训练机版本。

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Experimental results also demonstrated that benzoic acid was not an ideal substrate of lipase, which led to low conversion rates, but its limitation could be overcome by excess L-ascorbic acid.

实验结果同时表明：苯甲酸并不是理想的脂肪酶底物，但过量的L -抗坏血酸可以提高它的转化率。

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We proved that C-band seed light can promote L-band EDFA's pump conversion efficiency.

实验证实，加入C带种籽光后L带放大器的泵浦转换效率可以有较大的提高。

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