それはかなり大きな数だ。

Meaning
that's a pretty big number

Vocab used in this sentence

それ
it, that, there
a, the, is, am, are, will
かなり
quite, pretty, fairly, rather, considerably, comparatively
大きな
big, large, great, significant, huge, major
few, number, several, count, rate, couple
is, be, are, am, it is, seems

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