No one knows for sure why Mr. Gilson has lung cancer.

没有人确道为吉尔松会得肺癌。

They always know exactly what I need.

他们总是确道我需。

Therefore, I know exactly how much it is.

因此，我确道它是多少钱。

I can't tell you definitely when I will come.

我不能确告诉你我时候来。

Nobody in the world of science knew for sure.

在科学界，没有人确道。

We haven't really calculated the cost of the vacation yet.

我们还没有确计算出度假花多少钱。

The scientists could not know for sure how close the world was to war.

科学家无法确道世界离战争有多近。

No one knows exactly why they decided to descend upon the ceremony.

没有人确道他们为决定参加这个仪式。

So you need to know exactly how to give the right directions.

所以你需确道如何给出正确的方向。

Once upon a time, not too long ago, November 9, to be precise.

很久以前，确说是11月9日。

It's hard for kids to know exactly where their food is coming from.

孩子们很难确道他们的食物来自哪里。

We know exactly how these substances behave on Earth's surface.

我们确道这些物质在球表面的行为。

So, exactly how many times should you actually work out per week?

所以，确讲每周应该实际锻炼多少次呢？

Don't wait for you to know exactly what you need to say before you speak.

不等到你确道你需说才开口。

What is this show for exactly?

确说这表演是关于的?

So make sure you know exactly what type of essay you have to write.

所以确保你确道你写哪个类型的论文。

The expression today involves sheep – baby lambs to be exact!

今天的表达与绵羊有关，确说是小羊羔！

The most basic problem is knowing what, exactly, you are trying to rebuild.

最基本的问题是确道你重建的是。

So make sure you know exactly what type of word you are looking for.

因此，请确保你确道寻找的单词类型。

Shoppers also benefit from seeing exactly where—and to who—their money is going.

确了解他们的钱去了哪里以及给了谁。