Concentrations of positively charged particles develop at the top and bottom of the cloud, but the middle region becomes negatively charged.

带正电荷的粒子集中在云团的顶部和底部，但中间区域形成的是带负电荷的粒子。

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The new column has a header cell at the top, a data cell in the middle, and a footer cell at the bottom.

新列在顶部拥有一个头单元，中部的一个数据单元，以及底部的一个底单元。

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Then, that's not vertically simple because here in the middle, I have not only does top in this bottom, but I have this middle face.

这个区域不是垂直简单的,因为在中间这里，不仅有顶面有底面，我还有中间面。

youdao

Basically, what the libertarians are objecting to in this case is the middle 80 percent deciding what the top ten percent are doing for the bottom ten percent.

基本上，在这个例子中，自由主义者所反对的是,由中间80%的人来决定,上层的10%，应该为底层的10%做什么。

耶鲁公开课 - 公正课程节选

Nelson's injuries destroyed all three main skin layers - the epidermis, dermis and hypodermis (the top, middle and bottom), in some places right down to the periosteum, the membrane overlying the bone.

BBC: US Army seeks new ways to treat facial skin injuries

The trend for huge celebrations has "extended socially from middle and top down to bottom" and "now we all expect these events to be big and lavish".

BBC: Why has everything become a costly milestone event?

But when I went with Dinah and started hearing the words and the melody, I'm learning the whole song instead of just the bottom part, and also the middle and the top.

NPR: Keter Betts, Reflecting on a Life in Jazz