单词	crust
释义	crustcrust /krʌst/ ●●○ noun [countable, uncountable] Etymology ETYMOLOGYcrust Origin: 1300-1400 Latin crusta crust, shell 1 the hard brown outer surface of bread:  If the oven is too hot the crust will burn.2the baked outer part of foods such as pies and pizzas:  a pizza with a thin crust3a thin hard dry layer on the surface of something:  There was a thin crust of ice on the pond.4science, earth science, physics the hard outer layer of a planet, moon, etc., made up mostly of rocks:  the Earth’s crust
随便看	speed bump speed demon speed dial speed-dial speedily speediness speeding speed limit speedometer speed-read speed reading speed skating speedster speed trap speedup speedway speedy spell spellbinder spellbinding spellbound spell-check spell-checker speller spelling

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