1. 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。

　　2. But studies at the Clinical Research Institute of Montreal suggest that people who lack certain liver enzymes that help neutralize toxins may be at risk.

　　【结构分析】句子主干为：studies suggest that…，that引导其后的部分充当suggest的宾语;“at the Clinical Research Institute of Montreal”为地点状语;“who lack certain liver enzymes that help neutralize toxins”为who引导的从句充当people的后置定语，其中“that help neutralize toxins”为that引导的从句充当“liver enzymes”的后置定语。
 

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