回答

・grade
・class

「（柔道、劍道、書法等的）段、級數」在英語可以用 grade 或 class 等字來大略表達。

He has the second grade in Judo, so please stay by his side as much as possible.
（他有柔道二段的資格，所以請盡量待在他身邊。）

He's been learning calligraphy since last year, and it seems he already has the second class.
（他自去年以來一直在學習書法，看來他已經有二級了。）

有幫助｜0