1·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。
2·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。
3·The TC4 project will generate new data on the icy cirrus clouds that are formed in the upper atmosphere by heat-driven, or convective, storm systems that coalesce over warm waters in the tropics.
TC4工程将研究出关于含冰卷云的各种资料，这种云层是在大气上层中通过受热量驱使或对流的暴风雨变化过程中形成的，而此暴风雨也是与热带暖水海洋上空的状况密切相关。
4·At the solar surface, convective motions of heated gases jostle the magnetic field line.
在太阳表面，炽热气体的对流运动把这根磁力线冲来撞去。
5·It appears that improvement of convective heat transfer is very important for enhancement of flux and heat efficiency.
结果表明，提高对流传热系数是提高膜蒸馏热效率和渗透通量的关键。