obstructions n. 妨碍物;障碍(obstruction的复数)
- Working floors must be kept clear of obstructions and loose grit.
作业地面必须随时清除障碍物和松散的粗砂。 - As soon as early opticians figured out how to make glass without bubbles and other obstructions, they started making lenses out of glass.
随着早期的眼镜商发现如何制造没有气泡和其他障碍物的玻璃,他们开始用玻璃制造眼镜。 - As soon as early opticians figured out how to make glass without bubbles and other obstructions, they started making lenses out of glass.
较早期的眼镜商指出如何制造没有气泡的眼镜和其他障碍物,于是他们开始分开生产镜片和镜框。