Backlining
n. (加固书脊的)背衬料
🗣️ 情景例句
It's about the size of the United States, but it has a population of only 16.5 million.
它和美国一般大，但人口却只有一千六百五十万。
That's quite all right.
没关系。
Oh, yes, they are.
哦，对，是我的。