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。

The epidermis forms a continuous single layer of cells.

真皮是一个连续的单一细胞层。

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。

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。

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。