In some application, a narrow groove is cut into the piston above the top ring to serve as a "heat dam" to reduce the amount of heat reaching the top ring.
在一些实际结构中，一条窄槽切入顶端活塞环的上部，其作用是充当“隔热槽”以减少达到顶端活塞环的热量。
The horizontal arch ring type and its shape optimization are the two important considerations in arch dam design.
拱坝水平拱圈的线型和体形优化目标选择是拱坝设计的两个重要内容。
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