Below a certain threshold, they will not be strong enough to overcome the convective mixing of the gas at the surface, and spots will disappear altogether.

低于一定的临界值的话，它们将不足以克服表面气体的对流混合，因而太阳黑子将完全消失。

youdao

A star during most of its life is a main-sequence star, which consists of a core, radiative and convective zones, a photosphere, a chromosphere and a corona.

一颗恒星其生命的绝大部分处于主序星阶段，在这一阶段它包含一个核心、辐射区和对流区、光球层、色球层和日冕。

youdao

The horizontal width of the condensate falling from the convective cells was much less than the width of the observed mesoscale downdraft (60 km compared to 150 km).

从对流单体降落的冷凝物的水平宽度比观测到的做尺度下沉气流的宽度小得多（前者60公里而后者150公里）。

youdao

The convective turbulence pummeled the little Eclipse 500, but the ride wasn't too bad.

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Occupying its outermost third is a convective zone where gas is rising and falling in planet-sized cells.

BBC: Sun, Trace

Tangential entries cause the warm moist air to spin as it rises forming an anchored convective vortex.

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