the factory which we'll visit next week isn't far from here

我们下个星期要造访的工厂离这里不远
which是定语从句的引导词,在百度知道上搜一下“定语从句”就明白了.
附：which 没有实际的意思,是引导词,如果非要说他的意思,可以理解为“就是那个…的”,which we'll visit 译为“就是那个离这不远的”