However, scientists believe they were not the first animals on Earth.
然而，科学家们相信他们不是地球上第一种动物。
He started making plans to send a troop of celestial soldiers and generals to Earth on the fifteenth day of the first lunar month, with orders to incinerate all humans and animals.
他开始制定计划，派出一支天兵天将于农历正月十五来到人间，命令他们火烧所有的人和动物。
He started making plans to send a troop of celestial soldiers and generals to Earth on the 15th day of the first lunar month, with orders to incinerate all humans and animals.
他开始制定计划，派出一支天兵天将于农历正月十五来到人间，命令他们火烧所有的人和动物。
The tiny protozoans are believed to be the first animals to have appeared on earth.
人们认为小原生动物是首先出现在地球上的动物。
The tiny protozoans are believed to be the first animals to have appeared on earth.
一般认为小原生物是首先出现在地球上的动物。
He started making plans to send a troop of celestial soldiers and generals to Earth on the 15th day of the first lunar month with orders to incinerate all humans and animals.
他开始制定计划，准备派一支天兵天将于农历正月十五来到人间，命令他们火烧所有的人和动物。
He started making plans to send a troop of celestial soldiers and generals to Earth on the fifteenth day of the first lunar month, with orders to incinerate all humans and animals.
他开始制定计划，派出一支天兵天将于农历正月十五来到人间，命令他们火烧所有的人和动物。但是其他神仙并不赞同这一计划，他们冒着生命危险提醒人间的人们。
The first animals on this living sphere, the Earth, were primitive Marine animals, and then around 500 million years ago these sea animals developed shells.
在地球这个有生命的星球上，最早的动物是原始海洋动物。后来，在大约5亿年前，这些海洋动物进化成甲壳动物。
The first animals on this living sphere, the Earth, were primitive Marine animals, and then around 500 million years ago these sea animals developed shells.
在地球这个有生命的星球上，最早的动物是原始海洋动物。后来，在大约5亿年前，这些海洋动物进化成甲壳动物。
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