Being a gentleman has nothing to do with circumstances of one's birth. Being a gentleman is something one learns.

语音讲解：
单词发音
gentleman /ˈdʒentlmən/
circumstances 英/ˈsɜːkəmstɑːnsɪz/ 美 /ˈsɜːrkəmstænsɪz/
birth 英 /bɜːθ/ 美 /bɜːrθ/
词间连读
being a gentleman
/ˈbiːɪŋəˈdʒentlmən/
circumstances of one's
/ˈsɜːkəmstɑːnsɪzəvwʌnz/

词汇讲解
1. circumstance noun.
作“条件、环境、状况” ,为可数名词
circumstances：情况，境遇，（尤指）经济状况
live in affluent circumstances：生活在富裕的环境里，所以用复数。
作“命运，客观环境”意为不可数名词
固定搭配：
in/under the circumstances 在这种情况下，既然如此
in/under no circumstances 绝不，无论如何 放在句首，句子要倒装。
Afterwards, I wrote in my diary, under no circumstances should we erase great love of our parents because of their little faults.
事后，我在日记中写道，我们绝不能因父母的一点小过失而抹煞了父母伟大的爱。

2. have nothing to do with 与 ... 无关，不来往
His success has nothing to do with his wealth.
他的成功与他的财富无关。
I have nothing to do with my neighbour because he is a selfish man.
我和我的邻居不来往，因为他是个自私的人。

活学活用
have nothing to do with 与…没关系
This has nothing to do with you.
这事与你无关。

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