汉译英:"没有科学技术的迅猛发展，实现现代化是不可能的。"

without the fast development of the science and techology, achieving modernization is a lost cause.

It is impossible to realize modernization without the rapid development of science and technology.

说一下一个小地方，英文中的主句习惯放前面，和中文的习惯刚好相反。所以“没有...”这个要放后面。

Without rapid development of science & technology never the modernization can be achived/accomplished.

Without the rapid development of science and technology, it is impossible to realize modernization