然后沿着下颚线从嘴和下巴往外划圈。

Then follow the jaw line from your mouth outward as well as from your chin outward.

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刚开始刷牙的孩子，最好在牙龈与牙齿之间划圈。

Well, for starters, it's good to brush with a round motion between the gums and the teeth.

youdao

蝶泳类似于自由泳，但它需要双臂一同划圈，这样身体的运动更像海豚。

The butterfly stroke is similar to freestyle except that the arms circle together symmetrically and hence the body movement is more dolphin like.

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