of questionable antecedents;Of unknown origin;of dubious background来历不明 He appears to be a gentleman of many adventures and unknown antecedents他好像是一个绅士，冒过很多次险，可是身世不明。 .
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[of questionable antecedents;of dubious background; unidentified; of unknown origin] 指人或物的来路、历史或背景都不清楚 [incoming road;path of approach] 来的道路 .
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