这么说可以吗I want only a single rose, because it stands for sentimental single-minded.

I just want a single rose,because it stands for sentimental single-minded.是不是更通顺点儿

错得离谱了。
你想表达的是：我只想送你一只玫瑰，因为那代表的是一心一意？
I just want to give one rose, because it means you are the one and only.

可以，无语法错误。

just want

我看可以，因为当年我用了类似的话，效果不错。