Undistinguishable
a. 难辨别的, 难区分的
🗣️ 情景例句
Hi.
嗨。
I don't mind staying up late.
我不在乎熬夜。
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。