The scratch-and-win specialist marks the keys with printed codes and covers them with a special scratch-off layer (thermochromatic or other security inks could be used).
刮奖专家以印好的编码作为标记，并在上面覆盖一层可以挂掉的特殊涂层（可以使用热变色油墨或其他安全油墨）。
Beginning in the 1960s, physicists were using tools adapted from the semiconductor industry to create new materials from scratch, building them up layer-by-layer at the atomic scale.
在20世纪60年代初，物理学家们使用半导体工业中使用的工具来从头开始创建新材料，在原子尺度上一层层地建立它们。
Fourth, secondary plastering, and then wait for the percent 60 stem degrees according to shape a good scratch, finishes the basement, and according to your requirements of outside layer approach.
第四、做二次抹灰，然后待其百分之60干度时根据造型刮好，作好基底，及根据你要求的外面层做法做。
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