Place the tennis balls on the ground and then lie on them in the supine position (lying down face-up), keeping the knees bent.
把网球放在地上然后以仰卧位面朝上躺下、屈膝位躺在网球上。
Put the kids to lie flat, supine head to the side of the skew.
先让孩子躺平，平卧头向一侧歪斜。
Put the kids to lie flat, supine head to the side of the skew.
先让孩子躺平，平卧头向一侧歪斜。
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