例135　Indeed, only if we take note of what enabled man to survive against every conceivable hardship and danger, and what allowed him to adjust to the most drastic changes in his environment which finished many species less adaptable than himself, we will see that it was his instinct for cooperation.

【结构分析】这句话条件句是only if we take note of...，里面套上两个并列宾语从句，第一个宾语从句是what enabled man to survive against every conceivable hardship and danger，第二个宾语从句是what allowed him to adjust to the most drastic changes in his environment...，后面套上定语从句which finished many species...，后面套上比较级短语less adaptable than himself做定语，主干是we will see that it was his instinct for cooperation。

【亮点回放】此句话的亮点在于条件句的成功使用，其中套有两个超级的并列宾语从句，其中第二个宾语从句套有定语从句和比较级短语，很经典，两个宾语从句层层递进，确实很有气势。

【核心词汇】

take note of　观察

survive against　应对

every conceivable hardship and danger　每次可以想象到的困难和风险

adjust to　适应

the most drastic changes　最艰险的变化

finished many species　灭亡很多物种

adaptable　有适应能力的

instinct for cooperation　合作的本性

【参考译文】确实如此，如果我们思考一下什么使得人类能够应对每一次可想象到的困难和危险，如果我们思考一下什么使得人类能够适应那些已经把很多难以适应的物种灭绝的艰巨的变化，我们发现那就是人合作的本能。