section a-a a-a  剖面

A-A-A conjugation structure  A-A-A型共轭结构

get a commitment to  奉献

S-A(A-A) missile  地空导弹

A.A.A.  美国汽车协会

a got-up affair  圈套

got a chill  着凉

got a rise out of one  招惹

got a rise out of someone  招惹

got to  开始

have got to do  必须做

have got to do something  必须做...某事

A comment on Tai xuan Ping yi  《太玄平议》商兑

a converge to a  收敛于

a rare allergic reaction to a blood transfusion  罕有的输血过敏

a slope modified to a terraced field  坡改梯

A+A^2O process  A+A^2O工艺

A-1A  键控等幅波

A-A (ASEA-Atom)  瑞典原子通用公司