one two three five _____ _____ twenty-one中间的横线上填哪两个数词?

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one two three five _____ _____ twenty-one中间的横线上填哪两个数词?
x)KU()W((JMUH,KU(YRWR TdڗӷW

one two three five _____ _____ twenty-one中间的横线上填哪两个数词?
one two three five _____ _____ twenty-one
中间的横线上填哪两个数词?

one two three five _____ _____ twenty-one中间的横线上填哪两个数词?
1 2 3 5 8 13 21
1+2=3
2+3=5
3+5=8
5+8=13
13+8=21
应该填 eight 和 thirteen

eight 和 thirteen
规律是前两个数相加得到后一个数