Fold once at middle

Fold once at middle fold...down the middle fold at once at once at their middle age middle flaps的意思是折纸里面的原句是the difference between corner,edge and middle flaps顺便说一下valley fold,mountain fold,reverse fold,rabbit ear,的意思 都是折纸的术语 翻译：fold it down the middle.怎么翻译?内容是折纸. at once的同义词 用'at once造句, 英语翻译at once Everything At Once 歌词 at once啥意思 at once近义词各是什么意思 at once 的意思 at once意思? at once=什么? at once,immediately 区别