Flexiback
软背, 软脊(装帧)
🗣️ 情景例句
about leaving New York, the family, and friends.
对于离开纽约， 家人和朋友。
Short acquaintance brings repentance.
浅交生后悔。
They carved a whole page of characters back-to-front in the wood.
他们在木板上刻满整页的反字（背面朝上）。