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。

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Low effort: Install (more) compact fluorescent bulbs.

低努力：安装(更多)紧凑型荧光灯。

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Low effort: Install (more) compact fluorescent bulbs.

低努力：安装(更多)紧凑型荧光灯。

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