俄罗斯和美国在第一枚卫星发射五十周年纪念日，庆祝双方共同的太空成就，并宣布计划连手寻找火星和月球上的水资源。
Russia and the us celebrate joint space achievements on 50th anniversary of first satellite launch and unveil plans for partnership to search for water on Mars and the Moon.
而随着父母结婚五十周年纪念日的到来，我的兄弟和我计划为他们举办一次舞会。
As my parents' 50th anniversary approached, my brothers and I met to plan the party.
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