然后，他和爸爸一起顺着河流往下划游。

And he and his dad went paddling down the river together.

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手势：将食指与中指从眼睛往下划过整脸。

Gesture: Pass forefinger and middle finger down your face from your eyes.

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分类阶段从根开始，按照决策树的分类属性逐层往下划分，直到叶节点，获得概念。

Decision Tree Apply Model to Test Data Test Data Start from the root of...

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头朝下往下划时，不要将两手都放在前面，一只手要放到身体的侧面，这是防止身体失去平衡的必要措施。

Head first down the program, do not have the hands on the front, put a hand to the side of the body, it is necessary to prevent loss of balance measures.

youdao

头朝下往下划时，不要将两手都放在前面，一只手要放到身体的侧面，这是防止身体失去平衡的必要措施。

Head first down the program, do not have the hands on the front, put a hand to the side of the body, it is necessary to prevent loss of balance measures.

youdao