sixtieth ['sɪkstɪəθ]

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附加级

n.第六十（个）；六十分之一

The camera has a shutter speed of one-sixtieth of a second. 这架照像机的快门速度达六十分之一秒。来自《简明英汉词典》
He died in his sixtieth year. 他在步入60岁时去世。来自《简明英汉词典》