Control the floss by pinching it with index fingers and thumbs like this.

通过示指和拇指的牵拉来控制牙线.

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Spread your palms , index fingers parallel or slightly turned out, and turn your toes under.

食指互相平行, 或者轻微转向外, 并转脚趾向下.

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Firm the outer arms and press the bases of the index fingers actively the floor.

牢固手臂外侧并把食指的根基积极地压向地板.

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Keep the thumbs and index fingers pressing into the floor . Straighten the arms!

大拇指和食指用力下压. 伸展手臂!

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