单词：covalent bond
[化] 共价键
covalent bond的用法和样例：
例句
- In covalent bonding, atoms share electrons.在共价键联中，原子共有电子。
- Crystals may be classified as either ionic or covalent by analogy with molecules.与分子的情况一样，晶体也可以分为离子键型和共价键型。
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