Scientists think this is because of genetics and the environment that kids grow up in.

科学家认为，一方面是基因的原因，一方面则和他们生活的环境有关。

youdao

A lot of research has shown that people who are raised in a positive emotional environment have better physical and emotional health than people who grow up in an atmosphere of emotional conflict.

大量的研究表明，在积极地情感环境里长大的人比那些在情感冲突的人在身体上和心理上都要健康。

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But what if your mother and I created an environment where you would grow up to have a more plausible career than your dad?

但是如果事我和你的妈妈给你创造了一个比你爸爸更好的生长环境，使你可以有一个更合理的职业生涯呢？

youdao

Mister Boas believed that the environment people grow up in -- not family genes caused most cultural differences among people.

VOA: special.2010.01.17

As a teenager, I came to realize not everyone is fortunate enough to grow up in an environment that nurtures their confidence and encourages them to take on new challenges.

WHITEHOUSE: Turn A Problem Into Your Passion

Young Qataris grow up in this environment and into a land of wealth and privilege very different from their parents, most of whom experienced so little of the modern world that they did not even know their own date of birth.

BBC: Qatar: regional backwater to global player

The World Conference on Human Rights also stresses that the child for the full and harmonious development of his or her personality should grow up in a family environment which accordingly merits broader protection.

UNESCO: Vienna Declaration and Programme of Action