Opposability
n. 对抗性, 可相对性
🗣️ 情景例句
Blackjack.
二十一点！
These shoes are worn-out.They've lasted a long time.
这些鞋子旧了。已经用了很长时间了。
To escape from the Earth in a rocket, one must travel at seven miles per second.
要乘坐一枚火箭飞离地球，火箭的速度要达到每秒7英里，