The monkeys used in those experiments had previously been immunized with a vaccine made from killed infected cells.
这些实验中所用的猴子事先都已接种了由死亡的被感染细胞制成的疫苗。
猴子已被喂食了。
猴子们在大叫吗？
The monkeys can climb up the tree quickly.
猴子能很快爬上树。
The monkeys' task was to identify this second type as sparse.
猴子的任务是认出第二类图案是“稀疏的”。
The researchers then tested how the monkeys combined—or added the symbols to get the reward.
研究人员随后测试了猴子如何组合或添加这些符号来获得奖励。
Researchers will now be able to determine the parentage of individual monkeys from DNA without tranquilizing the monkeys.
研究人员现在可以通过DNA来确定单个猴子的血统，而不用对猴子进行麻醉。
Most of the monkeys' food is found at ground level.
猴子的食物大多可在地面找到。
To get to the lion's place we had to go through the monkeys' land first.
要到达狮子的地方，我们必须首先穿过猴子的地盘。
As the monkeys get better at completing their tasks, they learn new and more difficult ones.
当猴子完成任务的能力越来越强时，它们就会学习新的、更困难的任务。
After running hundreds of tests, the researchers noted that the monkeys would go for the higher values more than half the time, indicating that they were performing a calculation, not just memorizing the value of each combination.
在进行了数百次测试后，研究人员注意到，猴子有一半以上的时间会选择更高的数值，这表明它们在进行计算，而不仅仅是记住每个组合的数值。
这些猴子淘气吗？
In their cages the monkeys were provided with touch screens.
在笼子里的猴子们有触摸屏。
I remembered the stories he told me of how he fed the monkeys when he was a kid.
我记得他给我讲的他小时候喂猴子的故事。
How I wished I had some with me! William, the monkeys are taking long to come out today.
我多希望我身边有一些！威廉，今天猴子们花了很长时间才出来。
Normally, the monkeys were happy enough to exchange pieces of rock for slices of cucumber.
正常情况下，猴子们很乐意用石头换黄瓜片。
In this experiment, the monkeys had to identify certain patterns displayed on a computer screen.
在这个实验中，猴子必须识别电脑屏幕上显示的特定图案。
But the monkeys had no way to tell which reward or punishment was associated with which response.
但猴子们无法得知哪个奖励或惩罚对应于哪次回答。
But unlike in the dolphin experiment, the monkeys had to complete four trials before they got any feedback.
但与海豚实验不同的是，猴子们必须完成四项实验才能得到反馈。
If the monkeys touched the left side of the screen they would be rewarded with seven drops of water or juice.
如果猴子摸的是屏幕的左边，他们会得到七滴水或果汁的奖励。
As in a previous study, the monkeys were given a third choice that would allow them to pass on to a new trial.
在之前的研究中，猴子们得到了第三种选择，使他们可以继续进行新的试验。
Some scientists hypothesize that the monkeys rub their bodies with the millipedes because doing so helps protect them from mosquitoes.
一些科学家猜测，这些猴子用千足虫擦自己的身体，是因为这样做有助于保护它们免受蚊子叮咬。
When the tree falls，the monkeys scatter.
“树倒猴狲散。”
The monkeys were satisfied with that.
猴子么听了，都趴在地上表示满意。
Thereupon, the monkeys protested angrily.
猴子们听了，都怒气冲冲地站立起来。
The monkeys could understand what he said.
这些猴子能够听懂主人说的话。
The monkeys looked down. They saw the hats.
猴子们向下一望，看到了很多帽子。
They told me the monkeys have been captured.
他们告诉我，那两只猴子已经被捕。
The monkeys were very upset to see the children.
非常烦乱。猴子们看到孩子们感到非常烦乱。
The monkeys were very upset to see the children.
非常烦乱。猴子们看到孩子们感到非常烦乱。
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