龙门 (lóngmén) 楚国都城郢城(现在在湖北省江陵县西北)的东门 the east city gate of the capital of Chu State in Warring States Period of 475-221 B.C.
蹉跎
蹉跎 (cuōtuó) 时间白白地去;虚度光阴 waste time as making faltering steps 欲自修而年已蹉跎。——《晋书·周处传》 白日忽蹉跎,驱马复来归。——三国 魏· 阮籍《咏怀诗》 日月蹉跎 失足 slip and fall;take a wrong step in life