1·First produced in a lab back in 2004, graphene is essentially a single layer of pure carbon atoms bonded together in a honeycomb lattice so thin it's actually considered two-dimensional.
石墨烯最早在2004年诞生于一个实验室，本质上是一层由纯碳原子组成的蜂窝状晶格层，薄到竟被认为是二维物质。
2·A true epithelial tissue is present only in a single layer of cells held together via occluding junctions called tight junctions.
真正的上皮组织仅存在于通过称为紧密连接的咬合带而保持在一起的单层细胞中。
3·The epidermis forms a continuous single layer of cells.
真皮是一个连续的单一细胞层。
4·It can be used either as a single layer or multi-layer.
根据不同的使用状态，可以单层使用，也可以多层叠加使用。
5·Both were constructed of a single layer of stamped aluminum.
两种垫圈都是由单层冲压铝片而成。
6·Now, we have exact duplicate of the image in one single layer.
现在，我们已经精确的图像重复一单层。
7·These layers are called strata and a single layer is called a stratum.
这些岩层被称作地层（strata）（stratum的复数形式）， 单个岩层称为stratum。
8·Please find the typical process for single layer PWB for your reference.
您可以用下面的单层板典型流程做参考。
9·By examples, the single layer surfacing can meet the quality properties.
通过实例证明了进行单层堆焊就可达到质量要求。
10·Place potatoes in a metal roasting pan large enough to fit potatoes in a single layer.
取一只大的金属烤盘，要保证所有的土豆都能接触到烤盘，不会重叠。