Guilin is a city that attracts tens of thousands of tourists each year
译文：桂林是一座每年吸引成千上万名游客的城市.
Guilin is a city that attracts tens of thousands of tourists (who come from around the world) each year.
译文：桂林是一座每年吸引成千上万名（来自世界各地）游客的城市.
注：tourists 为复数形式,在定语从句中,用先行词 who 来代替,所以定语从句中的谓语动词要与 tourists 保持一致