First, the historical prologue that's so central to the suzerainty treaty, grounds the obligations of Israel to Yahweh in the history of his acts on her behalf.

第一点，历史开场白在领主契约中,是必不可少的，规定了犹太人,对上帝需要履行的义务。

耶鲁公开课 - 旧约导论课程节选

And as far as right now, just study hard, learn the material that will help you succeed.

就现阶段来讲，最重要的是勤奋学习，有一些知识是走向成功必不可少的，你要好好学习这些知识。

如果是在考虑留学 - SpeakingMax英语口语达人

We're going to get a deep insight if it's a necessary truth about death that everyone dies alone.

如果这是对死亡来说必不可少的真理,那我们能得到一些深刻理解。

耶鲁公开课 - 死亡课程节选

Because it's essential to locke's case that private property can arise even before there is any government.

因为洛克理论中必不可少的一点是说,私有财产在任何政府建立前就已经产生。

耶鲁公开课 - 公正课程节选

This is an essential part of the critique of structuralism.

这是结构主义评论的必不可少的一部分。

耶鲁公开课 - 文学理论导论课程节选

So, the jargon with that will-- with which we'll proceed is this.

那么，我接下来要介绍的是-,是一个必不可少，至关重要的工具。

哈佛公开课 - 计算机科学课程节选

So it's essential for the maintenance, preservation of the world.

因此祭仪对于维护世界的延续是必不可少的。

耶鲁公开课 - 旧约导论课程节选

Now, all of these parts of the brains are essential and many of them are implicated in interesting psychological processes but where the action is is the cortex.

所有的这些脑组织都是必不可少的,它们中的许多都会参与到心理活动之中,但其实真正的反应则发生在大脑皮层

耶鲁公开课 - 心理学导论课程节选

This "you have to" pattern is something that you really must learn,

you have to”句型是英语学习中必不可少的句型，

have to 课堂 - SpeakingMax英语口语达人

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

All of the cells that are reproduced during development are the same in certain ways, they contain the same DNA, they're all progeny of the same fertilized egg, but differences are acquired within specific cell populations during the process of development.

所有在发育过程中繁殖的细胞,在某些方面都是一样的,它们都有相同的DNA,都是同一个受精卵的后代,但是分化是在特定细胞类群,发育过程中必不可少的

耶鲁公开课 - 生物医学工程探索课程节选