Day 49
释义：n.a place, person, or thing from which something originates or can be obtained
例句：
1- Racial and cultural diversity has long been considered a source of strength for the US.
2-Liberty and autonomy are source of human dignity.
练习
1-翻译：姚明和刘翔让上海人感到骄傲。
→Yao Ming and Liu Xiang are the source of Shanghai people's pride.
参考翻译：
Yao Ming and Liu Xiang are a source of pride for Shanghainese people.
2-造句
场景：国家综合实力是其文化自信的基础。
A nation's comprehensive power is the source of its cultural confidence.
