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13.7十亿
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1.
About
13
.
7
Billion
years
ago
a
tremendous
explosion
started
the
expansion
of
the
universe
.
大约
13.7
十亿
年
前
巨大
爆炸
开始
了
宇宙
的
扩展
。
dà yuē
shí sān diǎn qī shí yì
nián
qián
jù dà
bào zhà
kāi shǐ
le
yǔ zhòu
de
kuò zhǎn
。
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