Sigma complex
[化] σ络合物
🧩 词语组成解析
[计] 求和\\n[医] σ(希腊文第十八个字母)
🗣️ 情景例句
and I stayed out an extra half hour.
我还特别多待了半个小时。
The joy of the heart makes the face merry.
喜形于色。
Mum and Dad were not at home.
爸爸妈妈不在家。