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。
The wing of Xenicibis (top) compared with that of a typical ibis Eudocimus (middle) and the extinct, flightless ibis Apteribis (bottom).
始祖鸟的翅膀(顶部)与典型鹮类(中部)和已灭绝不飞行的鹮类(底部)样本对比。
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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