optimum

adj. /ˈɑːp.tə.məm/ B2

最优的；最佳的

Best, most favourable, or most advantageous.

仙境例句

The old Tortoise said the optimum time for lessons was early morning, when the water was calm.

老陆龟说，上课的最佳时间是清早，那时海水最平静。