Learning words together that are associated in meaning is a popular and useful way of organising your vocabulary study
句子 together 最好是放在 words 和其后的定语从句中间，从语法上说，放在定语从句的后面也可以，即 Learning words that are associated in meaning together，但考虑到这个定语从句这么长，把 together 放到它的后面容易让读者或听众忽略 learn sth together 这个搭配所表达的意思。
