这是我们第一次接触伟大诗歌。

It was our first ___introduction to great poetry.

1998年，对许多人来说，这是首次体验家庭互联网接入。

In 1998, it was the first ___introduction to home internet access for many people.

这门课程是她第一次接触高等数学。

The course offered her first ___introduction to advanced mathematics.