我将要介绍的第一类边框是凸边或凹边。
The first type of frame I will show you is a raised or lowered border.
汽车的发动机罩已凹了进去。
证明：如果一个公司的生产函数是凹函数，那么它的利润函数也是凹函数。
Show: If the firm's production function is concave, it's profit function is concave.
针对给定的工件，进行挤压凹模的优化设计。
For the given workpiece, we make the optimum design of extrusion female die.
耐磨擦性是水性凹印油墨的一个重要性能，对包装印刷尤为重要。
Rub resistance was an important performance of water-based gravure ink, particularly important to package printing.
她们把她的床放在了公寓的其他地方，并把壁凹变成了一个壁橱。
They put her bed elsewhere in the apartment and converted the alcove into a closet.
她们把她的床放在了公寓的其他地方，并把壁凹变成了一个壁橱。
They put her bed elsewhere in the apartment and converted the alcove into a closet.
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