了解一个人的英语

We should know someone by heart.

we should pay much more attention to learn/ know about a person.

常见的是be aware of He doesn't seem to be aware of the problems. 他好像没有意识到这个问题。 As time went on,people came to be aware of the seriousness of China's population. 随着岁月的流逝，人们逐渐地认识到中国的人口问题的严重性。

know，recognize .see clear

take time to know a person 在这里“了解”用know来表达最地道,没必要挖空心思找些复杂的词