单词：sigma bond
sigma bond的用法和样例：
例句
- Marriage should be a permanent bond.婚姻应该是永恒的结合。
- The atoms bond together to form a molecule.原子结合形成分子。
- Bond strength is an important parameter for wafer bond.键合强度是关系到键合好坏的一个重要参数。
- One atom of oxygen is linked to the nitrogen atom by a double bond.一个氧原子以双键与氮原子相连。
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