常見(jiàn)例句雙語(yǔ)例句Mammals arose from a fairly primitive reptile in the mesozoic era .哺乳類(lèi)起源於中生代宛若原始的爬蟲(chóng)類(lèi)。The rift development slowly halted some 250 to 245 million years ago, around the beginning of the Mesozoic Era.這些裂縫的活動(dòng)在大約2.5-2.45億年前,即中生代初期逐漸停止了。The prints are believed to have been made during the Cretaceous period of the Mesozoic Era, Kim said in a statement.這些足跡被認(rèn)爲(wèi)是在中生代白堊紀(jì)時(shí)期由儅時(shí)鳥(niǎo)類(lèi)畱下的。 返回 mesozoic era