The President doesn't need a primer on national security.

总统对于国家安全是不需要读入门书的。

《牛津词典》

This article serves as a primer to SCJP certification.

本文是SCJP认证的初级教程。

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And if you aren't using a primer, it's time to get started.

如果你没有使用底霜，现在是时候开始了。

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Polymerase needs a primer and that turns out to be important.

聚合酶需要引物,这点非常重要

耶鲁公开课 - 生物医学工程探索课程节选

A primer is a short RNA sequence or DNA sequence that gets sort of the process of replication jump started, and that's just because of the biological properties of DNA polymerase that that primer's needed.

引物是一段短的RNA或者DNA序列,引物是整个复制的起点,因为DNA聚合酶的,生物特性,引物在复制过程是必不可少的

耶鲁公开课 - 生物医学工程探索课程节选

Two paint technicians simultaneously apply a primer coat afterward, working on opposite sides of the body.

FORBES: A Private Tour Of Aston-Martin's Factory

But it's a honey of a primer, by turns beautiful, eye-opening, mysterious and puzzling.

ECONOMIST: Works of art from the Aga Khan's collection on show in London

As a primer he offers lists of the ingredients necessary to stay alive and prosper.

ECONOMIST: Eating