用if引导的条件状语从句，这句话要怎么翻译啊

Question

如果不知道某个成语的出处，就很难理解其确切含义

Answer 1

原文：如果不知道某个成语的出处，就很难理解其确切含义。
翻译：If you don't know the source of an idiom, it is difficult to understand its exact meaning.
If you don't know the source of an idiom, it is difficult to understand its exact meaning

Answer 2

如果不知道某个成语的出处，就很难理解其确切含义
if we don't know where an idiom comes from, it is hard for us to to understand its exact meaning

Answer 3

If you don't know the source of an idiom, it's hard to understand its ture meaning.

Answer 4

用if引导的条件状语从句，这句话要怎么翻译啊，我的英语不好