十周年的英文：
decennial

They'll have a party for their 10th wedding anniversary.
他们将为结婚十周年开个晚会

There will be ceremonies to mark the tenth anniversary of the Queen’s accession.
为庆祝女王登基十周年将举行各种纪念活动。

They celebrated the 10th anniversary of the founding of the republic.
他们庆祝共和国成立十周年。

We congratulate you on your tenth wedding anniversary and wish you more happiness and satisfaction in the years to come.
祝贺你们结婚十周年，愿你们的未来更加幸福美满。