副詞 per annum:

1. by the year; every year (usually with reference to a sum of money paid or received)
   同義詞：p.a., per year, each year, annually

1. The rent be$2,500 per annum.
   租金每年2,500美元。
2. His salary was$25,000 per annum.
   他的薪水每年為25,000美元。
3. Factory inspector cost on average￡25,000 per head per annum.
   工廠檢查員平均每人每年花25,000英鎊。
4. The agency places about 2000 secretaries per annum.
   該代理機構每年可為約2000名秘書安排工作。