Nested sets
[计] 嵌套集合
🧩 词语组成解析
nested
[nestɪd]
adj. 嵌套的;
v. 筑巢( nest的过去式和过去分词 );
n. 集合, 设置（set的复数）
🗣️ 情景例句
It's an album of pictures of the United States:
是关于美国的
What does she mean by canceling her performance?
她取消自己的演出是什么意思？
Speculations about is nature have been going on for literally thousands of years,
人们对睡眠作用的种种猜测，确实有数千年之久。