上表层 meaning in English

upper epidermis

Gradually pour in the poppy mixture and sprinkle the streusel on the top
将罂粟仔馅倒入，然后洒上表层材料。
Firstly , the comparation study between the wedge pressing and the contour forging has shown that the transverse deforming initiated from the surface of the preforms . when the superficies reached the moulding wall , the deforming moved downwards as the high - direction deforming increased , till the moulding chamber was full of stock ; the transverse deforming of the moulding pressing stock initiated from the center of the stock then surned into a drum - type . the distribution of the density and hardness of the high - direction indicated that the wedge pressing acquired a better ability of pressing penetration
首先对比研究了楔形压制工艺与模压致密化工艺,发现楔压坯料的横向变形从上表层开始,当上表面与模壁接触后,随着高向变形量的增加逐步向下移动,直至坯料充满模腔;模压坯料的横向变形从坯料中间开始,形成鼓形。高向的密度、硬度分布表明楔压比模压具有更好的压透能力。