我想说能不能吐槽一下手机版的简书，已经不止一次在我即将编辑完成，直接就没保存原来的内容给我退掉了。可有时候又好好地自动保存了，你能让我找到一点规律吗。晕
source
可数名词，a source of 后常接抽象名词，比如 delight、strength、happiness、progress 等，是个非常实用、地道的写法。我们来看几个例子，体会一下这个常见表达的灵活用法。
例句
1、Racial and cultural diversity has long been considered a source of strength for the US. （美国的优势）
2、Conquering the world, as he had done time after time with pure punching skill, did not now seem the source of true happiness. （得到了快乐）
3、Liberty and autonomy are sources of human dignity. （赋予了人们尊严）
4、America’s political system can be frustrating. Believe me, I know. But it has been the source of more than two centuries of economic and social progress. （两百多年的经济社会进步得益于A）
英文的“a source of X”可以表达的意思远远多于“XX的来源”。比如例句中的“得益于” “赋予” “带来”，很多时候都可以用到“a source of X”
原谅基础差的我完全无法直接汉英、英汉切换source的用法，只能直接简单粗暴背诵了。
翻译：
Yao Ming and Liu Xiang are sources of the pride for Shanghailander.
造句
Since I graduated from school , I had hardly any chance to practice English. I think my experience of marathon is a source of the courage to pick up my learning English.
