Optimality
[计] 最佳性
🗣️ 情景例句
and they're so kind to me.
他们对我真好。
Hope is a good breakfast, but a bad supper.
希望是美味的早点，但又是难咽的晚餐。
He did a lot of research and travelled around the USA looking for information about his ancestors.
他做了大量的研究，在美国跑了许多地方，了解有关祖先的情况。