section a-a a-a  剖面

a two-man comic show  双簧

put two and two together  根据事实推理

two and a half dimensiona hexahedral meshing  2.5维六面体网格划分

two and a half dimensiona model  2.5维结构

two and two cheek  双经双纬格子花纹

two and two rib stitch  2╳2罗纹

two and two twill  二二斜纹

two-and-a-half-dimension  二又二分之一维

went to prison for two and a half years  入狱两年半

between man and man  两人间私下地

pheophorbide a and a’  脱镁叶绿甲酯一酸 a 和a′

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

S-A(A-A) missile  地空导弹

A.A.A.  美国汽车协会

One-two-two-four model  制造厂; 厂商; 制造者

a mechanical system of a shaft and two rolling bea  轴－滚动轴承系统

a two rate three color marker  AM真菌; 双速率三色标记

a two stage mixing of dough  两次搅拌; 丛枝菌根