1.They speedily discovered that their enjoyment of dancing and music was mutual, and that it arose from a general conformity of judgment in all that related to either.

【难句解析】句中有三个that，前两个引导的从句做discover的宾语；第二句中的it指代"their enjoyment of dancing and music was mutual"；

【句子翻译】 他们迅即发现，两人都爱好音乐和舞蹈，而且这种爱好还起因于他们对两者完全一致的见解。

2.and you have received every assurance of his admiring Pope no more than is proper.

【难句解析】No more than“不过、仅仅”；

【句子翻译】你还绝对相信他对波普的赞赏是恰如其分的。