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People act and learn together for a rich mixture of reasons.
人们一起做事与学习，原因复杂多样。
youdao
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The idle system supplies a very rich mixture to start with.
怠速系统提供很浓的可燃混合气供起动使用。
youdao
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The idle system supplies a very rich mixture to start with.
怠速系统提供很浓的可燃混合气供起动使用。
youdao