Null set
[计] 空集, 零集
🧩 词语组成解析
set
[sɛt]
vt. 放置，安置;使处于某种状况;设置;摆放餐具;
vi. 落山;出发;凝结;
n. 一套，一副;集合;布景;电视机;
adj. 固定的;位于…的;顽固的;安排好的;
🗣️ 情景例句
Too much alcohol will spoil your health.
喝过量的酒有损健康。
Can you help me out? I'm trying to find a post office.
你能帮我个忙吗？我想找个邮局。
We were developing too much waste.
生产出来的废品太多了。