抓住主题，不要把不相干的东西扯进来。
Stick to the point; don't bring in things that are irrelevant.
刚才辩护人说的都是题外话，他应该抓住主题。
What the defender has just said is neither there nor there. He should try to keep to the topic.
教师抓住主题图的两个故事创设美妙情境，为学生创造轻松愉快的学习氛围。
The teacher hold tight topic diagram of two story establish a wonderful scenario and pursue studies to living to create easy delectation of study atmosphere.
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