双两相四线制 two phase four wire system

双两相发电机 two phase generator

两双 double-double ; two pairs

单双打两用球场 combination court

两岐双岐杆菌 Bifidobacterium bifidum

一双/两双 a pair of , two pairs of

两双鞋 two pairs of shoes

两双袜子 two pairs of socks

双层足三两牛肉汉堡 Double Quarter Pounder