als abbr. aidolase 醛缩酶; advanced light source 高级光源; autographed letter signed 亲自签名的信件; autograph letter signed 署名亲笔信
ALSA abbr. American Land Sailing Association 美国陆地航行联合会; American Law Student Association 美国法律学生联合会; American Lap Swimmers Association (Incorporated) 美国环绕游泳者联合会(有限公司); Ansett Airlines of South Australia 南澳大利亚安塞特航空公司