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。

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."

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奇怪的是，老鼠更喜欢在第一组试验中那些代表需要大量付出的液体，不论是含淀粉的还是含糖的。

Surprisingly, the mice preferred the "high effort" liquid from the first experiment, no matter if it was starchy or sweet.

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玩家可以用即时通讯软件直接联系一个朋友并询问他，但是这需要玩家付出大量努力。

Gamers could use IM to contact a friend directly and ask, but that required a lot of effort on the part of the user.

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