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	spark counter special theory of relativity specific specific activity specific charge specific gravity specific heat capacity specific humidity specific impulse specific intensity specific latent heat specific resistance specific surface specific volume spectral class spectrochemical series spectrograph spectrometer spectrophotometer spectroscope spectroscopic binary spectroscopy spectrum speculum speed

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