来历: origin; source; antecedents; background; past history 短语和例子查明来历 trace to the source; ascertain a person's antecedents
感恩节: t hanksgivingthanks givingthanksgiving (canada)thanksgiving (disambiguation)thanksgiving (united states)thanksgivingdaythe first thanksgivingthe thanksgiving day
来历不明: unknown source or origin; it is not clear how he comes by so many valuables.; it is not clear how he comes to occupy the present important position.; obscure [unknown] origin; of dubious b
