Arccos
反余弦
🗣️ 情景例句
Carl, does your throat hurt?
Carl，你喉咙痛吗？
Did you go to the school last night?
你昨晚去学校了吗？
Instead of being five new family members, these children had immediately become a commodity.
这些孩子立即成了商品，而不是5个新的家庭成员。