出典:Wiktionary
North German and Dutch surname, a patronymic form of Siebe, from the personal name Siebert.
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the seventh
7時に.
7回
7分の1
a seventh
There're seven. 7
8分の7
seven eighths
the seventieth
7個
seven twelfths
7時ごろに
along about seven
数は 7 つ.
the sixtieth
7分の4
four sevenths
a heptad
6時に.
the ninth