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十亿年
shíyì nián
geol.
aeon
;
giga annum
space
eon
tech.
billion years
天
十亿年
shíyì nián
archit.
aeon
十亿年
美
shíyì nián
gen.
billion years
美国、法国
十亿年
shíyì nián
geol.
billion years
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