Wind the dangling floss around the middle finger of the other hand.
将悬挂着的牙线缠绕在另一只手的中指上。
Honey, you know, the middle finger?
亲爱的,你知道,竖中指吧!
Normally the middle finger is the longest.
手指头一般都是中间那根最长。
Now take these two fingers-- the middle finger and the thumb-- and as much as possible, from that 90 degree angle, create a circle.
再让这两个手指-,中指和姆指-,尽可能保持直角时围成一个圆圈。
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