El backlight with the keyboard features: the application of light at night or dark environment relatively long time job, be able to clear a long time to language, design, the keyboard is displayed.
带el背光源的键盘特点：适用夜间或光线长时间比较黑暗的环境工作，能够长时间清晰地将文字、图案、键盘显示出来。
The steel structure is getting more and more application because of its light weight, big span , short time limit for a project, various styles , easy to protect the environment and so on.
钢结构由于其重量轻、跨度大、工期短、表现丰富、利于环保等特点，正得到越来越广泛的应用。
The application only needs to project one face-shaped light spot pattern and only needs one-time imaging so as to finish the measurement of the space coordinates of all the light spots on the face.
本申请只需投射一幅面状光点图案且只需一次成像即可完成测量出该面上所有光点的空间坐标。
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