1. In 1929 a great celebration was held on his fiftieth birthday in Berlin.
    1929年, 在他五十寿辰的时候, 人们在柏林举行大的庆祝会.

2. In 1929 a great celebration was held on his fiftieth birthday in Berlin.
    1929年, 在他五十寿辰的时候, 人们在柏林举行大的庆祝会.

3. In 1929 a great celebration was held on his fiftieth birthday in Berlin.
    1929年, 在他五十寿辰的时候, 人们在柏林举行大的庆祝会.