Using properly counterexamples in the teaching of Probability Theory will help students have a good understanding of the course, warm up their active thinking and improve teaching quality.

在概率论教学中，恰当的运用反例教学，可以帮助学生加深对该课程的理解，并激发他们积极思维，有助于提高教学质量。

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Dissolve yeast in warm ale, along with 1 Tbs. of the flour mixture. Your yeast should bubble up after a few minutes, indicating that the yeast is active.

将干酵母与1汤匙面粉溶解在温热的爱尔啤酒里。如果酵母几分钟后开始冒泡泡，就代表已经发酵完成了。

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Those undesirable effects were generally found, however, only if each stretch was held for more than 60 seconds and the subject then immediately became fully active, with no further warm-up.

然而，这些不良影响基本是在运动员每次拉伸保持60秒以上并且不做进一步的热身马上开始充分运动的情况下才发生。

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