他们的用户对全局变量的概念应该了然于胸。

Their users already understood the concept of global variables.

因此，我对你的问题是早已了然于胸的。

Therefore, I've clearly detected your question.

枢密院司法委员会有两个特别的性质需要了然于胸。

Two unusual features of the Judicial Committee of the Privy Council should be borne in mind.

未来于我了然于胸：儿女长大、离家，与丈夫白首偕老，带养孙子孙女。

I knew exactly what to expect in the future. The children would grow up and leave home, my husband and I would grow old together, and we'd baby-sit the grandchildren.

这样你就对那类信息可以泛读哪类需重点记忆了然于胸！

By doing this you can figure out what information is critical to memorize and what can be skimmed.