非坚持性载波感应式多重进接
carrier sense multiple access
nonpersistent
坚持把德育放在首位
moral education as a top priority
坚持打造绿色食品
adhere to green food production
坚持改革开放
Adhere to reforms and opening to the outside world
坚持环境保护基本国策
adhere to the basic state policy of environmental protection