2019年翻译资格考试初级笔译模拟题：石墨

　　石墨晶体结构遭到破坏时，总是碎化为微小尺寸的片状粉末。孤立的石墨烯片在其边缘存在大量的悬挂键，使得石墨烯片的能量较高，状态也不稳定。石墨烯片卷曲形成碳纳米管后，悬挂键减少，系统能量相应降低。

　　参考译文

　　When a graphite crystal is crushed, it breaks into micro-scaled laminar flakes. There are many dangling bonds on the edge of an isolated graphite micro-sheet which elevates its energy and makes it unstable. When a graphite micro-sheet curls into a nanotube, the number of dangling bonds decreases, and the system energy is reduced accordingly.