Under optimum conditions, these cars can reduce harmful emissions by up to 50 per cent.在最佳条件下, 这些汽车可以减少高达50%的有害排放物。

trying to achieve the optimum rate of economic growth努力实现经济最快增长

Aim to do some physical activity three times a week for optimum health.为了达到最佳的健康状况, 要力争每周进行3次身体锻炼。

Various things must be balanced to live life to the optimum.必须将种种事情平衡好才能生活得最好。