这一问题可以通过添加阻燃剂来解决，如卤素化合物和无机氢氧化物等。
This problem can be solved by using flame-retardant additives, such as halogenated compounds and inorganic hydrated compounds.
不幸的是，卤素化合物面临很大的环境问题，而无机添加剂效率都较低。
Unfortunately, halogenated compounds are serious environmentally problem, and inorganic additives have poor efficiency.
用AM1 方法计算了20 个卤素及三卤甲基侧取代氮、硫杂冠化合物分子的电子结构。
The electronic structures of 20 nitrogen, sulfur heterocrown ether compounds with side substitute of halogen and trihalomethyl have been calculated by means of AM1.
结果表明该类化合物具有很好的光学漂白性，含卤素取代酞菁的漂白效果明显好于不含卤素酞菁的效果。
Results showed that this kind of compounds has excellent photobleaching property. The bleaching effect of phthalocyanines containing halogen substituent is better than the one that is not substituted.
硫与卤素的几种化合物在工业上有重要用途。
Several sulfur compounds with halogen elements are industrially important.
本发明涉及式（I）化合物及其药用活性盐，其中R1是氢、低级烷基或苄基，其可任选地被卤素或低级烷氧基取代；
The present invention relates to compounds of formula (I) wherein R1 is hydrogen, lower alkyl or benzyl which may be optionally substituted by halogen or lower alkoxy;
卤素原子同氮化合物一样，作为净化剂。
The halogen atoms play the same scavenging role as nitrogen compounds.
结果表明：单一卤代酚的生物毒性随着卤素原子数目在化合物中的增多呈增强趋势；
The results indicated that the single toxicity of the six halophenols enhanced with the increasing of the halogenoid atoms;
综述了在甾体化合物11 -位引入羟基的各种化学合成方法，主要包括酮基还原法、上脱卤素法、硼烷双氧水法、过氧化-还原法等。
Introduction of 11-hydroxy group into steroids by chemical methods, such as keto-reduction, halogenation-dehalogenation, borane-hydrogen peroxide and peroxidation-reduction are reviewed.
综述了在甾体化合物11 -位引入羟基的各种化学合成方法，主要包括酮基还原法、上脱卤素法、硼烷双氧水法、过氧化-还原法等。
Introduction of 11-hydroxy group into steroids by chemical methods, such as keto-reduction, halogenation-dehalogenation, borane-hydrogen peroxide and peroxidation-reduction are reviewed.
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