optimum
(also optimal ) adj [attrib 作定语]
(fml 文) best or most favourable 最佳的; 最适宜的; 最有利的
the optimum temperature for the growth of plants 植物生长的最佳温度
enjoy optimum economic conditions 处於最佳经济状况.
On our way home that night I looked down and saw that the necklace was not around my neck any more. I told Pierre. We rushed back to the palace and looked for it.We asked everyone there if they had found a necklace, but without luck. We couldn't find it;