The rocket experimental data indicated that the layered dusty plasma structure has a sharp boundary in the summer polar mesopause.

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。

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Sharp boundary inversion is a relatively difficult problem in magnetotelluric and other geophysical inversion , which has been studied by many researchers.

尖锐边界反演是大地电磁及其他地球物理反演中的一个较难解决的问题，目前有不少专家正对这方面进行研究。

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It is possible to draw too sharp a boundary between prophetic and merely symbolic images, between mad vision and coded cartoon.

NEWYORKER: The Big Reveal

The return of Kevin Pietersen galvanised England and he batted beautifully and although he was clearly hampered by his Achilles injury and in no mood to run sharp ones or twos, he found the boundary five times, and cleared it three times as England improved on their 14 fours against the Dutch with 18 fours and six sixes here.

BBC: Jonathan Agnew column