时差N小时 只有在地球上才能燃烧?(下)

But before this process had been in place for a while, there wasn't enough oxygen in the air for things to burn.

但是，在此转化之前的一段时间，空气中没有足够的氧气可以燃烧东西。

In fact, of all the planets, moons, asteroids¹, and comets in our solar system,

而事实上，整个太阳系的所有的行星、月球、小行星、彗星，

the only place where you can actually start a fire is right here on earth.

你会发现唯一可以生活的地方只有地球。

And even here, it's only been possible relatively² recently.

而就算是地球，也是不久以前才可行。

1 asteroids   

n.小行星( asteroid的名词复数 )；海盘车，海星

参考例句：

• Asteroids,also known as "minor planets",are numerous in the outer space. 小行星，亦称为“小型行星”，在外太空中不计其数。
• Most stars probably have their quota of planets, meteorids, comets, and asteroids. 多数恒星也许还拥有若干行星、流星、彗星和小行星。

2 relatively   

adv.比较...地，相对地

参考例句：

• The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
• The operation was relatively painless.手术相对来说不痛。