A Collector shows a souvenir sheet of the Chinatown Gates stamps she bought at a post office in Toronto, Canada, May 1, 2013. Canada Post launched a special series of stamps featuring Chinatown gates located in eight cities across the country on Wednesday to highlight the longstanding heritages of Chinese-Canadians. [Photo/Xinhua]

Illustrator Albert Ng (L) unveils one of the Chinatown Gates stamps with his grandson at a post office in Toronto, Canada, May 1, 2013. Canada Post launched a special series of stamps featuring Chinatown gates located in eight cities across the country on Wednesday to highlight the longstanding heritages of Chinese-Canadians. [Photo/Xinhua]