be the first on earth

基本解释

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。
It's believed to be the first evidence of pollutants affecting one of the most remote habitats on earth.
据信这是污染物影响地球上最遥远的动物栖息地的首例证据。
The vents may also be where chemistry first became biology—that is, where life on earth began—and thus be scientifically priceless.
这些喷口也可能是化学物质最初转化成生物的地方，也就是生命最初存在的地方，因而其科学价值极高。

That means that by the time President Barack Obama is no longer in the White House, the new president will be the first since World War II to not govern the most powerful economy on Earth.
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And this Navy fighter jet -- appropriately called the Green Hornet -- will be flown for the first time in just a few days, on Earth Day.
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The first Fox title under the agreement will be Avatar, which hit stores on Thursday in time for Earth Day.
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