只能是其壹；
例句
1.From where we stand, there can only be one choice.
從我們的角度看，只能有壹個選擇。
2.The reason is because there can only be one default profile in the entire product installation.
因為在整個產品安裝中只能有壹個缺省的概要文件。
3.There can only be one way out, namely: throw everything you have into freeing yourself!
唯壹的出路只能是：竭力解放自己！