求语法讲解.What follows applies only to those dictionary offices where first-hand research goes on

楼主的句子还有下半句— not those in which editors simply copy existing dictionaries.
1,翻译：接下来的只适用那些进行第一手研究的字典编辑室,（而不适用那些编辑们只照抄现有字典的编辑室）.
2,这是个“主语--谓语--宾语”结构的句子.
主语（从句）：What follows
谓语：applies only to
宾语：those dictionary offices
where first-hand research goes on是定语从句,修饰dictionary offices .
3,apply to 是固定短语,适用于.,only是修饰这个短语的.
4,是的
5,go on是 “发生,进行”的意思.

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