他如此专注于正在做的事情，以至于没有听到铃声。

He was so ___engrossed in what he was doing that he didn't hear the bell.

如今的年轻人如此专注于学习，以至于没有太多空闲时间享受自己。

Youngsters these days are so ___engrossed in their studies that they do not have much free time to enjoy themselves.

她完全沉浸在这本小说中，忽略了周围的一切。

She was completely ___engrossed in the novel, ignoring everything around her.