source：a place, person, or thing from which something originates or can be obtained
a source of 后常接抽象名词，比如 delight、strength、happiness、progress 等
例句：Racial and cultural diversity has long been considered a source of strength for the US.
翻译：Yao Ming and Liu Xiang are sources of pride for Shanghai people.
造句：Freedom and democracy are sources of the American spirit.
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