Unnested
(unnest 的过去分词) abbr. United Nations
🗣️ 情景例句
Robbie, I want you to meet
Robbie，我要你见过
Many great men have arisen from humble beginnings.
有许多伟人出身卑微。
so every so often a sample is obtained with a coring bit.
因此时常要用取芯钻头取样。