英语中关于one的句子Liu xiang broke up 110米跨栏,...we will never forget

The more correct way of saying this is:
这是最正确的用法.
Liu Xiang set a new world's record in men's 110m Hurdles,which we will never forget.
Which clause modifies the main clause.
which clause -- which we will never forget.
main clause -- Liu Xiang set a new world's record in men's 110m Hurdles.
Other alternatives:其他的正确用法.
1.Liu set a new world's record in the men's 110 meter Hurdles; we will never forget that.
2.Liu set a new world's record in the men's 110 meter Hurdles.We will never forget that.
3 Liu set a new world's record in the men's 110 meter Hurdles; we will never forget it.
4 Liu set a new world's record in the men's 110 meter Hurdles.We will never forget it.
5.Liu set a new world's record in the men's 110 meter Hurdles; that we will never forget.
6.Liu set a new world's record in the men's 110 meter Hurdles.That we will never forget.
Note:Liu xiang broke up 110米跨栏,one we will never forget.这句话是错误的.它不符合美语的正确用法.显然不是美国人写的.你最好相信我,因为我刚和老美交换过意见.

楼上说的很对，one 既可指代事物，也可指代人；而其余三者只能指代事物。
整句话要分开来说的话，就是
Liu xiang broke up 110米跨栏。 we will never forget（？）。
意思是：刘翔打破了110米跨栏，我们从来不会忘记”他“。
forget是及物动词，后面缺少个宾语，而这其中代指人的只有“one ”，所以就选他它。...

what,which,it都是指事物的啊，one既可以表示事物，也可以表示人，句中指刘翔，当然要用one