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
She always talks to me as though she were my sister.
她总是以我妹妹的口气跟我说话。
Do you have a phone book(directory)?
你有电话簿吗？
She stamped out the letters 'SOS' in the snow.
她在雪地上踩出了“SOS”这3个字母。