Marriages don't break up on account of infidelity. It's just a symptom that something else is wrong.

语音讲解：
单词发音
marriages /ˈmærɪdʒɪz/
infidelity /ˌɪnfɪˈdeləti/
symptom /ˈsɪmptəm/
词间连读
don't break up
/dəʊntbreɪk'ʌp/
on account of infidelity
/ɒnəˈkaʊntəvˌɪnfɪˈdeləti/
something else is
/ˈsʌmθɪŋ'elsɪz/

词汇讲解
1. on account of phrase. 因为
He was granted special admission on account of his effort.
由于他自己的努力, 他被破格录取。
2. infidelity noun. 不忠贞
fide 词根=faith 信用
The marriage broke up because of the wife's infidelity.
婚姻因妻子的不忠而破裂了。
3. symptom noun. 症状 征兆
Cough is often a symptom of illness.
咳嗽常是疾病的征兆。

活学活用
on account of phrase. 因为
The flight was postponed on account of bad weather.
因为天气恶劣,飞行延期了.

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