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Occasionally, usually around their anniversary, ... (Para. 15)
anniversary: n. day that is an exact number of years after something happened
Today we are here to celebrate the 50th anniversary of the founding of the People's Republic of China. 今天，我们在这里庆祝中华人民共和国成立50周年。
v. 庆祝，庆贺，颂扬
