PREFIX（前缀）
　　1.a-:of;on;intensive;negative,not,without;ad-；ab-.
　　2.ab-:away from,off.
　　3. ad-:to;at;for.
　　4. aer(o)- :relating to air .
　　5.al-:all.
　　6.ambi-:on both sides,around.
　　7.amphi-:on both sides,around.
　　8.an-:negative,not,without.
　　9.ana-:upon,up,on.
　　10.ante-:before.
　　11.anti-:against.
　　12.arch-:chief,first .
　　13.astro- :relating to stars .(planets\space )
　　14.aqu(a)-:relating to water.
　　15.audi (o)-:relating to sound and hearing .
　　16.auto-:self,without help .
　　17.be-:to make;to cover with;upon;by;intensive.
　　18.bene-:well,good.
　　19.bi-:double,two.