Demonstration expense
[经] 示范费, 展出费
🧩 词语组成解析
🗣️ 情景例句
It is great.
的确是太好了。
He that would know what shall be must consider what has been.
欲知未然，须思已然。
If there had not been a hard layer of rock beneath the soil, they would have completed the job in a few hours.
如果不是因为土壤下面有一层坚硬的岩石，他们的营救工作仅用几个小时就可以完成了。