N. y. d.
[医] 尚未诊断
🧩 词语组成解析
abbr. 名词
基督教青年会
🗣️ 情景例句
They have an opening.
他们有一个空房间。
When the fire started, I was writing letters.
当火起来的时候，我在写信。
has spent his lifetime studying active volcanoes and deep caves in all parts of the world.
花了毕生的精力来研究世界各地的活火山和探洞。