練習(xí)步驟：
step1：劃分句子結(jié)構(gòu)，找句子主干
step2: 確定修飾詞，修飾短語或修飾從句的修飾關(guān)系
step3: 確定代詞指代對象
劍橋雅思9
Reading Passage 2
長難句：The mere existence of such a civilization will tell us that the older civilization may pass on the benefits of their experience in dealing with threats to survival such as nuclear war and global pollution, and other threats that we haven't yet discovered.