I think of how small I am and how vast the sky is.

我想到我是多么渺小，而天空是多么广阔。

youdao

As someone put it, "Without visiting Xinjiang, one wouldn't know how vast China is."

中国有句话说得好， 不到新疆不知道中国有多大。

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The frog could not imagine how vast the sea is, as he has never seen it.

可是青蛙从没见过海，根本想象不出海有多大。

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This is an interesting little sign of just how vast Apple has become.

FORBES: Apple's iTunes is, Standing Alone, One Of The Largest Media Companies

It illustrated how vast the search is (and will become) and its potential impact on Earth's inhabitants.

CNN: Should we fear space aliens?

Just looking at all those question marks gives an idea of how vast this topic of research is.

BBC: Facebook profile photo experiment goes live