The most likely time for this firstentry of pit viper ancestors into the New World was during the middle Oligocene, about 30 millionyears ago.是什么意思_The most likely time for this firstentry of pit viper ancestors into the New World was during the middle Oligocene, about 30 millionyears ago.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句