You might even understand the sacred essentiality of water and say that water is life.

你甚至可能理解水的神圣重要性， 并说水就是生命。

Given the essentiality of railroads to the economy, a national emergency seemed in the offing.

鉴于铁路对经济的重要性，全国性的紧急态似乎即将到来。

So our bodies don't make enough C-15, which is why it meets this definition of essentiality.

因此，我们的身体无法产生足够的C-15，这就是为什么它符合必需性的定义。

So now we have three other independent teams have looked at it on their own, and they have all concluded that C15 meets the criteria of essentiality.

现在， 我们还有另外立团队各自进行了研究，他们一致认定C-15符合必需性的标准。