However, PUD possess some shortcomings including low solid content, low hardness and not so good chemisty-resistance, it is necessary to modified PUD.
然而PUD存在固含量低、涂膜硬度偏低、耐水性不好等缺点，需要对其进行有效的改性。
The determination of absolute configuration for chiral compounds is one of the most important problem in the organic chemisty, especially for chiral drug synthesis.
手性化合物绝对构型的确定一直是有机化学特别是手性药物合成研究过程中经常遇到的问题之一。
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