句中的 X 怎么样翻译成汉语

There was a sentence about X that I would have crossed out.

这个句子摘自章振邦的语法训练，请问这个句子怎么样翻译？

可将X翻译成“某”：

There was a sentence about Xthat I would have crossed out. 有个关于某内容的句子被我给删掉了。

又如：

Let us say Mr X gives aproperty to his son. 譬如说，某先生把一份财产给了他儿子。

假如与Y并用，也可翻译成“甲”“乙”。如：

The children on trial werereferred to as child X and child Y. 受试儿童被称作儿童甲和儿童乙。

若是表示数字，则可直接用x表示。如：

Let x have the value 25. 设 x 的值为 25。

Make X greater than or equalto zero. 假设 X 大于等于零。