to the core

例句：

1. She's American to the core.
   她是地地道道的美國人。
2. It took a long time to get to the core of the affair.
   花了很長時間才抓住這件事的要害。
3. Let's get to the core of the argument.
   咱們進入實質性的辯論吧。
4. He is American to the core.
   他是個地地道道的美國人。