Most lightning flashes occur near the strong convective region, and a few flashes occur in the stratiform region of the squall line.

绝大多数闪电发生在对流区，有少数闪电出现在层云区域。

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The residual effects of the cloud clusters are generally ignored even though the area they cover is perhaps an order of magnitude larger than the convective region itself.

云团的残余影响通常是忽略不计的，即使它们覆盖的地区比对流区本身可能大一个量级也如此。

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For the cold protosolar accretion disc, convective instability will gradually end from the outer region to the center and from the surface to central plane.

原太阳吸积盘为冷的薄盘，盘中热对流不稳定性由外而内，由上而下地终结；

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Below the convective zone lies a radiative zone, which is a calmer region, where photons transport the Sun's energy outward.

BBC: Sun, Trace