[气象] pressure topography 等压面气球 constantpressure balloon ; pressure balloon ; constantlevel balloon ; level balloon 等压面坡度 isobaric slope ; slope of an isobaric surface ..
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constant level balloon [气象] 定高气球
constant-level balloon 定高气球
level balloon
水平的气球
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Unstable means that if an imaginary balloon filled with air from near the ground were to be lifted upward, colliding with some weather feature such as a cold front, the "balloon" would become warmer than the surrounding air at that level.
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