It was probably caused by people seeing many different animal tracks and failing to distinguish them as separate.
在早期,研究人员指出,不同动物的胚层数量存在差异。
Early on,researchers noted a fundamental difference in the number of germ layers in different animal groups.
一个漫画家,被剥夺了在一张纸上画不同动物的能力,并不是一个完整的艺术家。
A cartoonist who lacks the ability to draw various animals in a piece paper, isn't a complete artist.
当然,我们仍然需要在实验室中使用不同动物进行更多的研究,”他说。
Of course, we still need more studies in the laboratory using different animals," he said.
与此同时,人们对活体动物营销和各种不同动物物种的消费仍有强烈的文化偏好。
At the same time, there remains a strong cultural preference for live animal marketing andthe consumption of a wide variety of different animal species.
一个门标志通往焚烧炉,另一个门没有标识,但我可以听到门后传来不同动物的声音。
One said to incinerator room, and the other had no sign,but I could hear various animals noises coming from behind the closed door.
这款游戏可帮助儿童认识不同动物的叫声,还有助于锻炼记忆力。
This game will help children learn the different animal sounds, and it will help them use their memories.
当然,我们仍然需要在使用不同动物的实验室进行更多的研究,”他说。
Of course, we still need more studies in the laboratory using different animals," he said.
Knowing how different animal groups are impacted by changing land-use could help us better understand how these ecosystems function and the consequences of biodiversity change.
虽然来自不同动物的牛肚在世界各地消费,但它并不像心脏,肝脏和肾脏等更常见的器官肉类那样受欢迎。
While tripe from different animals is consumed around the world, it's not as popular as more common organ meats like heart, liver and kidney.
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