Use your forefinger to follow the line on the page. This focuses your vision onto a specific part of the text.
用食指跟随阅读，这样可以使视线集中在文本上。
Alternatively use the thumb and forefinger.
交替地使用拇指和食指。
Use your thumb and forefinger to gently work the floss between two teeth, being careful not to pull it roughly or saw it back and forth, both of which can injure the gum.
用你的食指和拇指轻轻地在两齿之间拨动牙线，小心一点不要太粗鲁或前后牵动，这样会伤害到牙龈。
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