The machine was missing a key component.

这个机器丢失了一个重要零件。

There are really two key components.

有两个关键原因。

Of course, it is. Two of the key components of the course are time management and overcoming procrastination.

当然。课程的两个关键部分是时间管理和克服拖延症。

The key component is a technology called Optical Character Recognition, or OCR.

关键是一种称为光学字符识别（OCR）的技术。

And it's a really key component to making these tiny copper wires.

并且这是制造这些微小铜线的关键部分。

Sodium is a key component in our cell's ability to function in general.

钠是细胞的关键组成部分。

I think another key component to it is understanding that children expect a lot.

我认为，另一个关键要素是要明白，孩子的期望值很高。

But a key component of mucus versatility is a set of proteins called mucins.

但是黏液的多功能主要 来自於一组称为" 黏蛋白" 的蛋白质。

Apparently, a key component in some forms of humor is the element of surprise.

显然，有些幽默的关键要素在于出其不意。

And disturbances in norepinephrine transmission is thought to also be a key component in depression.

去甲肾上腺素传递的紊乱也被认为是抑郁症的关键诱因。