If you want to train a laboratory rat to pull a crank to get a food pellet, the reflex will be scratched in deeper if the creature is rewarded with some regularity but not all the time.
如果你想训练一只实验室老鼠拉曲柄去拿到一粒小丸，并定时给它一些小奖励的话，(但不是每次都一样，)那么这个小东西的条件反射会更强烈。
Because of the nervous reflex activity in sleep, the muscles of the throat relax, the food is easy to slide into the trachea, is very dangerous.
由于睡眠时神经反射活动减弱，咽喉肌肉松弛，食物容易滑入气管，是非常危险的。
Because of the nervous reflex activity in sleep, the muscles of the throat relax, the food is easy to slide into the trachea, is very dangerous.
由于睡眠时神经反射活动减弱，咽喉肌肉松弛，食物容易滑入气管，是非常危险的。
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