仅就地球的母星系-银河系而言，每年都会出现数十次。
Several dozen a year happen in Earth's home galaxy, the Milky Way, alone.
因此挑选一条优质的母犬十分重要。
谐声系统中，晓母的谐声关系十分复杂。
In Old Chinese Phonetic system, xiaomu series are very complicated.
谐声系统中，晓母的谐声关系十分复杂。
In Old Chinese Phonetic system, xiaomu series are very complicated.
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