热门： obviously happy 单词大全

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首页英语词典CC英英释意

C

英美[si]

英英释义词组搭配考试真题实用场景例句

symb. 碳（carbon）
n. 字母C

英英释意

1. the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second