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。
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。
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