Kids play tee ball, hitting a stationary ball until they are ready to have their coaches toss to them;

小孩们打乐乐棒球，击打固定的球，直到能击到教练抛给他们的棒球；

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Images with the crystal ball can be stationary or move around as if viewing a screen.

水晶球图像能被定住或来回晃动好像看荧光屏屏幕一样。

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During a swing, the shoulder turns completely while the pelvis remains relatively stationary facing the ball, causing stress on the lower spine or lumbar region, the researchers said.

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If a moving ball runs into another, stationary one head-on, it can come to a dead halt.

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