观察结果表明：饲以高脂膳食20天后，高脂组大鼠血清胆固醇水平显著高于对照纽，猪油组显著高于豆油组。
The results revealed that the experimental rats fed with high lipid diets for 20 days showed obviously increased serum cholesterol level, which was higher in lard group than that in soybean oil group.
科学家做了这样一个实验。让一组鸡啄红色和绿色的按纽，啄数次后，就可以吃到食物。
In another experiment, a scientist taught a group of chickens to peck red and green buttons a certain number of times to obtain a food reward.
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