Flexiback
软背, 软脊(装帧)
🗣️ 情景例句
My instructor thought that the beginner's class was too easy for me.
老师认为初级课程对我来说太容易了。
The racer's car burst into flames just as he had crawled out.
当赛车手爬出车子后不久，汽车就爆炸燃烧了起来。
But I must ask my parents first. What time shall I come?
不过我必须先问问父母。我几点钟来呢？