The two systems are, at bottom, conceptual models.

这两个系统实际上是概念模型。

《柯林斯英汉双解大词典》

"Universal history, the history of what man has accomplished in this world, is at bottom the History of the Great Men who have worked here," wrote the Victorian sage Thomas Carlyle.

维多利亚时代的圣人托马斯·卡莱尔写道：“通史，即人类在这个世界上取得的成就的历史，本质上就是在此努力过的伟人的历史。”

youdao

But what was June, 1848, at bottom?

但是，究其实，1848年六月到底是怎么回事？

youdao

"Now if you look at that bottom picture on your pages, you'll see that you can measure the length and the width of that spatter droplet,right?

VOA: special.2010.05.05

Thus, the dictum could be dared in the psychoanalytic school: at bottom, nobody believes in his own death.

在精神分析学院会有这种说法：,说到底，没人相信自己的死亡。

耶鲁公开课 - 死亡课程节选

so it's either, you're at the bottom of the spectrum and you're barely making it,

不管你是哪一个，都是在两个极端，你只能勉强度日，

生活费偏高 - SpeakingMax英语口语达人

This is at bottom a fight within Islam, not a fight between Islam and the West.

ECONOMIST: Much has been achieved, but things are now going badly

At bottom, the Massachusetts plan--and others like it--is more of a nudge than a clear-cut solution.

FORBES: The Future Of Universal Health Care

Steve Jobs, throughout all his brilliant years, had at bottom just one product: joy.

FORBES: What Steve Jobs Really Gave Us: Joy