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- Electrons closer to the nucleus are held more tightly than those in the outer orbits. 靠近原子核的电子比外层轨道上的电子结合得紧。
- Free radical are a highly reactive group of atoms, molecules or radicals, which carry unpaired electron in outer orbital. 外层轨道上有单个不配对价电子的原子、原子团或分子。
- An electron in an atom's outer orbital can take on energy (letting it jump to a higher band) by absorbing a photon or can release energy (dropping back down) by emitting one. 而位于原子较外轨道的电子可吸收光子取得能量（藉此跳到较高的能带），或发射光子释出能量（掉回原来的能带）。
- The spacecraft is in orbit around the moon. 该航天器在绕月球轨道运行。
- Dust the repair to prevent adhesion to outer cover. 清整修补处以防与外胎粘连。
- " This free radical has at least one unpaired electron in its outer orbit essentially giving it an electrical charge. 下次有大型聚会的时候，仔细看看不同年龄的人的皮肤，当然是年龄造成的差异。
- The hard outer portion or surface area of bread. 面包皮面包的表面区域的硬皮
- An outer coat of glaze on a piece of pottery. 外层釉陶器釉面上的第二层釉
- The space shuttle will orbit a weather satellite. 太空梭将把一个气象卫星送入运行轨道。
- The launch vehicle lifts the satellite into orbit. 太空火箭将人造卫星送入运行轨道。
- The outer walls of the building were painted blue. 这座建筑的外墙被漆成了蓝色。
- outer orbital coordination compound 外轨配合物
- Something of circular form; a circle or an orbit. 圆形物体圆形物体; 圆圈或环形轨道
- A loose outer garment, such as a cape. 披风，斗篷一种宽松的外衣，例如斗篷
- Has anybody ever seen any beings from outer space? 有人见到过外星人吗?
- The spacecraft is in orbit (ie moving in orbit) round the moon. 该航天器在绕月球轨道上飞行。
- The two modules docked in outer space. 两个飞行舱在外层空间对接。
- Marketing does not come within the orbit of his department. 市场推销业务不归他这一部门管。
- The outer projecting portion of the ear. 心耳耳朵的外部突出部分
- An outer corner, as of a building. 外角，如一幢建筑的外角
