一級的的用法和樣例：
例句
-
那是第一級的郵件，收到時(shí)卻處于第二級的狀態(tài)。
It arrive by first-class mail in second-class condition. -
那是第一級的郵件，收到時(shí)卻處于第二級狀態(tài)。
It arrived by first-class mail in second-class condition. -
必須具備大專(zhuān)院校的學(xué)位才能從事這一級的工作。
A degree is prerequisite for employment at this level.
