hk.drsunyatsen.museum...Cai Sidu Cai Sidu (1884-1970) was a follower of Dr Sun Yat-sen's...
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hk.drsunyatsen.museum...Cai Sidu Cai Sidu (1884-1970) was a follower of Dr Sun Yat-sen's revolution. He set up the Flying School for Chinese in America in San Francisco in 1916 to