一も二も無く[ichimonimonaku] unhesitatingly
一言二言[hitokotofutakoto] a word or two
一石二鳥[issekinichou] killing two birds with one stone
一二に及ばず[ichininioyobazu] right away
一姫二太郎[ichihimenitarou] It's good to have a girl first and then a boy

うり二つ[urifutatsu] as alike as two melons (two peas in a pod)
黄道十二宮[koudoujuunikyuu] twelve signs of the zodiac
二度[futatabi] again
最小二乗法[saishounijouhou] least-squares method
三十二分音符[sanjuunibuonpu] 32nd note

加糖[katou] sweetening
加糖粉乳[katoufunnyuu] sweetened powdered milk
果糖[katou] fructose
花林糖[karintou] fried dough cake
角砂糖[kakuzatou] cube sugar

含糖[gantou] sugar content
含糖量[gantouryou] sugar content
金米糖[konpeitoo] small coloured sugar candy covered in bulges
血糖[kettou] blood sugar
原糖[gentou] unrefined sugar