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劃分句子成分有助于理解句子意思和修飾關(guān)系：
①【Research 主語】【is謂語】【 also the chief （means 定語從句先行詞）表語】【 by which we humans attempt to satisfy our instatiable appetite for knowledge,and our craving to understand ourselves and the world around us.定語從句】
②by which 【we從句主語 】【humans 同位語】【attempt to satisfy 謂語】【（our instatiable appetite for knowledge）,and （our craving ）并列賓語】
【to understand ourselves and the world around us不定式短語,做 定語,修飾第二個(gè)賓語】就是說means 是先行詞嗎， 那為什么要用by which呢，看不出后面的部分有比較的意思 用in which不行嗎介詞加關(guān)系詞的使用，涉及一個(gè)固定短語：【用這種方式/方法】：by this meansmeans做先行詞，介詞+關(guān)系詞就只能是by which還有一個(gè)表達(dá)：in this way即 way 做先行詞，表示【用這種方式/方法】，介詞+關(guān)系詞那就是 in which.