You know you should floss, but "should" is not enough.

你明白应当用牙线清洁牙齿，但“应当”是远远不够的。

Hold the floss tightly between your thumbs and forefingers, with about an inch (2.5 cm) of floss between them.

两只手的食指和大拇指分别捏紧牙线的一端， 中间留出一英寸长（2.5厘米） 。

Craft Resources also sells yarn and embroidery floss.

“手工之家”也售卖纱线和绣花丝线。

You should floss too.

你也该用牙线清洁牙缝。

Are Asians more likely to floss their teeth?

亚洲人用牙线清洁牙齿的比例更高吗？