A layer composed of the particle-size composition of characters and symbols is spread on the external surface of the upper margin, used as identified markers.
一层组成的颗粒粒度组成的字符和符号传播，对外部表面的上缘，用来作为识别标记。
A layer composed of the particle-size composition of characters and symbols is spread on the external surface of the upper margin, used as identified markers.
一层组成的颗粒粒度组成的字符和符号传播，对外部表面的上缘，用来作为识别标记。
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