1. When a discovery has reached a stage where it is recognized and appreciated by its originator, there are still at least three more ways in which its general acceptance may be delayed. 【结构分析】句子主干为：there are still at least three more ways；“in which its general acceptance may be delayed”为which引导的从句充当“ways”的后置定语；“When a discovery has reached a stage where it is recognized and appreciated by its originator”为when引导的时间状语，其中“where it is recognized and appreciated by its originator”为where引导的从句充当“a stage”的后置定语。 2. Or, if you smear peanut butter, which is low in methionine, on a piece of wheat bread, which has plenty of methionine but little lysine and isoleucine, you again have a complete protein. 【结构分析】句子主干为：you again have a complete protein；“if you smear peanut butter, which is low in methionine, on a piece of wheat bread, which has plenty of methionine but little lysine and isoleucine”为if引导的条件状语从句，其中“which is low in methionine”为which引导的从句充当“peanut butter”的后置定语，“which has plenty of methionine but little lysine and isoleucine”为which引导的从句充当“a piece of wheat bread”的后置定语。
