understand 了解。know about 了解；知道关于。realize 明白；意识到。
例句：
1、我们不完全了解大脑是怎样构成的。
We do not fully understand how the brain is organized.
2、医生对这种疾病还不太了解。
Doctors still don't understand much about the disease.
3、了解他的真实信仰会是很有意思的。
It would be interesting to know what he really believed.
4、了解自己的优缺点很重要。
It's important to know your own strengths and weaknesses.
5、本这个人我们了解，能叫我们等很长时间。
Knowing Ben, we could be waiting a long time.
火星的星星
