Femtometer
n. 千万亿分之一公尺
🗣️ 情景例句
Are you all right?
你还好吗？
A tree is known by its fruit.
观其行而知其人。
They had just had enough time to swim out of danger when the boat again completed a circle.
他们刚刚来得及游出危险区，快艇就又转完了一圈。