10年以上英文

ten years

对的。但是用It took him as long as ten years to finish this book.我觉得更好。

More than 50% of sales person have at least ten years sales experience.这句话用的是至少10年和10年以上是一样的意思如果是More than 50% of sales person have more than ten years sales experience. 这句话more than 就重复了。

翻译：ten years

50% of the sales people have more than 10 years' experiences in their field.