it will also make china's high-speed railway technology known to the world翻译,为什么用known
问题描述：
it will also make china's high-speed railway technology known to the world翻译,为什么用known
答
它也会使中国的高铁技术为世界所知.
主语是高铁技术,高铁技术只能是被知道,所以用known