The front cover exactly matches this shape and also has a raised circular area that fits into a matching countersunk area of the block in front of the main bearing.
封面完全匹配这个形状和也提出了圆形区域，可以成为一个匹配埋头面积块前面的主轴承。
A metal or non-metal thin layer on the central area of front cover is in contact with said absorbing layer for transferring impact waves.
在约束玻璃板的外侧表面上涂有光能吸收涂层，与该层接触的前盖中部是金属或非金属的薄层，以传递冲击波。
A metal or non-metal thin layer on the central area of front cover is in contact with said absorbing layer for transferring impact waves.
在约束玻璃板的外侧表面上涂有光能吸收涂层，与该层接触的前盖中部是金属或非金属的薄层，以传递冲击波。
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