Ministry of Education 《Revised Mandarin Chinese Dictionary》

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Word	河外星系
Bopomofo	`ㄏㄜ^ˊ` `ㄨㄞ^ˋ` `ㄒㄧㄥ` `ㄒㄧ^ˋ`
Hanyu pinyin	hé wài xīng xì
Interpretation	銀河系以外的星系。