英语：nine
读音：英[naɪn]、美[naɪn]
意思：num. 九。
举例：I arrive at the hospital at eight o'clock, but I don't go on duty until nine.
我八点钟就到医院了，但是九点钟我才去值班。
eight
读音：英[eɪt]、美[eɪt]
意思：num. 八。
举例：I'm hardly functional if I don't get eight hours' sleep!
我要是不睡上八个小时就无法工作！
