n.保险( insurance的名词复数 )，保险业，保险费，保险措施...

insurances的音标：...

Trace element mixes serve as insurances.微量元素只是作为一种保障措施.First of all, some doctors don't participate in some insurances by definition.首先, 一些医生 肯定 不会参加某些保险.These five kinds of insurances all exist the certain problem....