Sigma bond
[化] σ键
🧩 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
We will also need a letter of recommendation.
我们还要求一封推荐函。
Would you please tell me your phone number so that we'll ring you up as soon as the remittance arrives?
您能否把电话号码告诉我，以便汇款一到就给您打电话？
At the moment in my country there are very few such schools.
目前在我国这类学校太少了。