Metamaterial
n. 超材料
🗣️ 情景例句
How fast can my mail be received?
我的信件多快会被收到？
A mother's love never changes.
母爱永恒。
The airport was built years ago, but for some reason it could not be used then.
机场是许多年前建的，但由于某种原因当时未能启用。