例如，对动物的研究表明，老鼠在怀孕期间经历压力会导致胎儿表观遗传发生变化，进而导致啮齿动物在成长过程中出现行为问题。
Studies of animals, for example, have shown that when a rat experiences stress during pregnancy, it can cause epigenetic changes in a fetus that lead to behavioral problems as the rodent grows up.
但是超出这种原始情感和可预见的行为反应，即需要思维过程的复杂的动物情感，其存在的可能性是难以证明的。
But beyond such instinctual emotions and their predictable behavioral responses, the possibility of more complex animal feelings — those that entail mental processing — is difficult to demonstrate.
试图根据动物的行为洞悉它们的心理过程在情况最好的时候也是十分棘手且主观的。
Trying to discern an animal's thought processes on the basis of its behaviour is notoriously tricky and subjective at the best of times.
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