He shook the paws of both of them warmly, never waiting for an introduction to the Mole.

他热情地握着他俩的爪子，从不等鼹鼠莫尔来介绍。

Just an introduction to the classes of potential foreign invaders that our immune system tries to defend us against.

这只是对我们的免疫系统试图防御的潜在外来入侵者的分类介绍。

The notes are intended as an introduction to the course.

这些笔记的目的是作为对这门课程的介绍。

Every paper should have an introduction and conclusion.

每篇文章都应该有导言和结论。

I see this as a course that's an introduction to the literature of a period, to modern poetry.

我认为这是一门关于某个时期的文学和现代诗歌的入门课程。