Optionality
n. 期权性风险
🗣️ 情景例句
Surprise.
惊喜。
Yes,I had breakfast two hours ago.
是,我2小时以前吃了早餐。
It is thought that they arrived more than 30,000 years ago by crossing a land bridge from Asia to America.
他们被认为是在3万多年以前从亚洲跨越一座陆桥来到美洲的。