柯林斯词典ninetieth /ˈnaɪntɪɪθ/ 1. ORD The ninetieth item in a series is the one that you count as number ninety. 第90 He celebrates his ninetieth birthday on Friday. 他周五庆祝他的90岁生日。 返回 ninetieth剑桥词典90th written as a word 第九十(的) 返回 ninetieth