劍橋詞典from or referring to the earliest period of time , between about 4,600 and 543 million years ago, from when the earth was formed until the first simple forms of life appeared 前寒武紀(jì)的（地質(zhì)年代的最早堦段，迄今約46-5.43億年前之間，自地球開(kāi)始形成起至第一個(gè)簡(jiǎn)單形式的生命出現(xiàn)） Precambrian time 前寒武紀(jì)時(shí)代／時(shí)期 Precambrian rocks 前寒武紀(jì)巖石 the Precambrian noun [ 單數(shù)名詞 ] uk Your browser doesn't support HTML5 audio us Your browser doesn't support HTML5 audio the Precambrian period of time 前寒武紀(jì)時(shí)期 返回 Precambrian