The mice drank significantly more of the low calorie liquid when it was from a "high effort" lever compared to when it was obtained relatively easily.
对于低热量的液体，当需要更高付出而不是相对容易些的时候，老鼠明显喝了更多。
Slowly, the researchers adjusted the number of times the lever had to be pushed, ranging from once for "low effort" and up to 15 times for "high effort."
研究者慢慢地调整需要推动操纵杆的次数，从代表少量付出的1次到代表大量付出的15次。
The override action occurs when a slight pull toward the driver on the switch lever providers high beam headlights regardless of the amount of light on the sensor-amplifier.
轻轻朝着驾驶员的方向拉动开关控制杆这一动作，就可以使前照灯远光灯泡点亮，而不用顾及灯的数量。
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