同时要做到轻拿轻放，避免压伤、压凹、压坏。
At the same time should be handled with care, to avoid bruising, indentation and crush.
压凹：用不着墨的电版或模在纸上压成凹纹效果的方法。是浮雕压印的相反。
Debossing: the process of pressing a recess image using an un-inked block or die on paper or board. It is the opposite of embossing.
差压计锻件可以采用普通开式模锻成形和可分凹模多向闭塞精密模锻成形。
The differential gauge forging can be made by general open die or horizontal split precision closed die.
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