Chlorization - hydrolysis, electro oxidation and a method using p - nitro - toluene as starting material were described mainly.重点介绍了氯化水解法 、 电化学氧化法及对硝基甲苯法....
我们是走着去你婶婶家, 还是坐汽车去 呢 ?Shall we walk round to your aunt's house, or take the car?有些人是坐汽车来的, 其他的是走着来的.Some people came by car, others came on foot.我呢,骑自行车去, 你们呢,坐汽车去.I'm going by bike, and you may go by bus....
I took the precaution of clearing out my desk before I left.我临走时特地事先把办公桌清理了一下。I took the precaution of locking money in the safe.我把所有的钱都锁在保险箱里以防万一.Could he not, just as a precaution, move to a place of safety?...就算仅仅是为了以...