凸凹面 meaning in Chinese

male and female face
maleandfemaleface

This series can print production dates , expiring dates and batch numbers and simple pictures on various bottles , cans , cups and boxes . and it can also print on various materials like metals , plastics , glass , china and other uneven surfaces , the printing speed high and printing letters clear
本机适用于各类瓶、罐、杯、盒包装上打印出厂日期、保质期、批号及简单图案，可在各种材料如金属、塑料、玻璃、陶瓷等不同凸凹面上印刷，印刷速度快、字体美观清晰。