中层顶 mesopause
- 气晖观测是研究中层顶区动力过程的重要方法。
Airglow measurement is an important method of studing the dynamic processesin the mesopause region. - 火箭探空实验观测结果显示,极区夏季中层顶尘埃等离子体分层中存在着稳定的锐边界结构。
The rocket experimental data indicated that the layered dusty plasma structure has a sharp boundary in the summer polar mesopause. - 很多种鸟常常混群共同迁徙,但是当他们停下来觅食休息的时候,你就会发现不同的种类有的在地面上,有的在中层高度,有的则在树顶处。
Mixed flocks of several species often travel together, but when they are feeding or resting you will spot different birds on the ground, at mid-level heights and at the tree tops.
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