单词	thunderstorm
释义	thunderstorm A convective storm accompanied by lightning and thunder and a variety of weather conditions, especially heavy rain or hail, high winds, and sudden temperature changes. Thunderstorms originate when intense heating causes a parcel of moist air to rise, leading to instability and the development of cumulonimbus cloud — a towering cloud with a characteristic anvil-shaped top (see illustration). The exact mechanisms of thunderstorms are not fully understood. They occur most frequently in the tropics but are also common in the mid-latitudes. Cross section through a thunderstorm cell
随便看	differential equation differential geometry differentiation diffraction diffraction grating diffusion diffusion cloud chamber diffusion limited aggregation diffusion pump digit digital audio tape digital computer digital display digital recording digitron dihedral dilatancy dilation dilatometer dimensional analysis dimensions diode dioptre dip dipole

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