/ˈɒptɪməm; US ˈɑ:p- ||; ˈɑptəməm/adj (only
before a noun 只用于名词前)
1 (also optimal) the best possible, giving the best possible results 最佳的；产生最佳效果的
2 the optimum noun [sing] the best possible result or the best set of conditions to get good results 最佳效果；最佳条件