This paper describes the phenomena of welding deformation of low carbonsheet steel, analyze the causes and put forward the measures of prevention through discussing some instances in detail.
本文以具体实例，详细地论述了低碳钢薄板件焊接变形的现象，原因及防护借施。
2
Graphene is a flat sheet of carbon just one atom thick—with the carbon atoms arranged in a honeycomb lattice.
石墨烯是一种只有单原子厚度的碳原子平面层——碳原子按蜂窝状晶格排列。
3
Graphene is a super strong sheet of carbon that's only one-atom thick.