you xi xi
你喜喜
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The wind rustling xi xiao cold, owe money xi you want to also!
风萧萧兮易水寒，欠了钱兮你要还！
youdao
If you have a sample with n observations, it's the summation I = 1 to n of xi/n--that's the average.
如果你有n个观测值,对Xi从i=1到n求和再除以n
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