Leave a gap at the top and bottom so air can circulate.

在顶部和底部各留一点空隙，这样空气就可以流通了。

《柯林斯英汉双解大词典》

The top and bottom line of each column on the page should align.

版面每栏的头一行和末一行要对齐。

《牛津词典》

We cleaned the house from top to bottom.

我们把房子彻底打扫了一遍。

《牛津词典》

They have an opening at the bottom for the fire and a place on top to put a pot.

VOA: special.2010.02.01

In fact, the water at the bottom of the waterfall is hotter than the water at the top of the waterfall.

实际上，瀑布底部的水,的确比顶部的水要热。

麻省理工公开课 - 热力学与动力学课程节选

We just go through the list top to bottom, left to right, and cross names off as we go.

我们会从上到下，从左到右看那个问题清单，如果解决了就把名字擦掉。

哈佛公开课 - 计算机科学课程节选

For example, it may be the case, as is shown in recent studies, that income at both the top and bottom has grown, but income at the top grew faster.

FORBES: In Asking About Income Inequality, Obama Begins With The Wrong Question

The bottom line here is that our standard of living is sinking like a stone and the income gap from top to bottom is at a all time high and the percentage of rate vs. actual dollars in revenues paid is far in favor of the higher income brackets than the average wage earner.

FORBES: Top Reagan Advisor Calls Out The GOP For Lying About Taxes

In some cases, it may require rethinking a financial plan from top to bottom.

WSJ: Money Issues of Surviving Spouses