R ” 是取化基,如乙氧基 、 甲氧基及它们的环氧和烷氧同系物或卤基.R " is a replaceable function , e . g . acetoxy, methoxy, their acyloxy and alkoxy homologs or halo.通过选择特定的同系物混合物, 可以达到应用性能的优化.By selection of specific homologous mixtures, application ...
I believe in seasoning food before putting it on the table.我认为在把食物端上餐桌前应该先调味。I believe in the maxim "if it ain't broke, don't fix it".我相信这样一条箴言：“不破不修”。Don't tell me you still believe in all that stuff?别告诉我...
斯特兰德街是伦敦最繁华、最富足的街道之一。The Strand is one of London's busiest and most affluent streets.富足的食物供应a bountiful supply of food有些人非常富足,而另外一些人食不果腹.Some people live in plenty while others haven't enough to eat....