Another challenge is that if your members respond with interaction, you can get off track from the main points of your sermon, and lose some control in a worship atmosphere.

另一个挑战是如果信众进行互动，你可能会游离讲道的要点，在敬拜的气氛中失去控制局面。

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You can also discuss circular motion with your class, explaining why the ball doesn't fall off the track at the top of the loop.

你也可在班上讨论圆周运动，为何球不会在圆周的顶端掉下。

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