Flexiback
软背, 软脊(装帧)
🗣️ 情景例句
It is also not polite to ask people questions about politics.
另外，问一些关于政治和宗教的问题也是不礼貌的。
There's nothing to do because tomorrow is a holliday.
无所谓因为明天是假期。
Letters will cost a little more, but they will certainly travel faster.
这样会稍微多花点钱，但肯定是快得多了。