在对闸瓦式制动器进行动力学分析的基础上，论述了它的设计方法和步骤，并给出了机械效益的计算公式和设计曲线图。
Based on dynamics analysis and brake shoe type arrester, its design method and steps are discussed in this paper. Calculation formula of mechanical benefit and design is introduced.
中国湿地面积的减少、功能和效益的下降昭示着中国保护湿地资源的行动迫在眉睫。
As a result, it caused the diminishment of natural wetland, which warns China to take a quick step to protect the wetland resource.
该设备可追查所有倾物入海行动。 透过记录船只的吃水深度和位置，当局便能够以更符合经济效益的方法，追查非法倾物入海活动。
This device tracks all marine dumping operations by recording the position and draught of the vessel, so that the authorities can trace any illegal dumping in a cost-effective manner.
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