必由之路 bìyóuzhīlù the only way Origin Definitions Defs Strokes Stroke Words Sentences Sents 必 bì auxiliary must must; have to; required to; be required to由 yóu nounpreposition via via; through; by way of; to pass through之 zhī particle [possessive] Connects a describing word or phrase to the noun it describes, similar to 的 de but used in formal or literary writing.路 lù noun road road; path; way; route