常見例句Cambrian The earliest period of the Paleozoic era, about 590-510 million years ago. 寒武紀:地質(zhì)年代古生代的第一個紀，在五億九千萬到五億一千萬前。Of,belonging to,or designating the geologic time,system of rocks,and sedimentary deposits of the seventh and last period of the Paleozoic Era. 二疊紀的，二疊巖的是、屬于或標明為古生代第七個和最后一個階段的地質(zhì)時期、巖層及沉積礦藏。Cambrian: the beginning of the Paleozoic Era Animals with hard-shells appeared in great numbers for the first time during the Cambrian. 寒武紀：古生代的開始（距今5億1,400萬年前），具有硬殼的生物在寒武紀第一次大量出現(xiàn)。Of, belonging to, or designating the geologic time, system of rocks, and sedimentary deposits of the seventh and last period of the Paleozoic Era. 二疊紀的，二疊巖的是、屬于或標明為古生代第七個和最后一個階段的地質(zhì)時期、巖層及沉積礦藏The major structure in the area is the NE-NNE folded belt consisting of Banxi Group of the Middle Proterozoic era to the Ordovician system of the Early Paleozoic era. 由新元古界板溪群至下古生界奧陶系所構(gòu)成的NE-NNE向褶皺帶為區(qū)內(nèi)主體構(gòu)造；Of, relating to, or designating the geologic time, system of rocks, and sedimentary deposits of the second period of the Paleozoic Era, characterized by the appearance of primitive fishes. 奧陶紀（系）的屬于、有關或指奧陶紀（系）的，奧陶紀（系）是指古生代第二紀的一段地質(zhì)時間、巖石系統(tǒng)及沉積物，該紀以早期魚的出現(xiàn)為特征 返回 paleozoic era