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1.The engineer performed a retarder operation to slow down the train's speed.
工程师执行了一个减速操作，以减缓火车的速度。
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2.During the emergency, the firefighters carried out a retarder operation to control the spread of the fire.
在紧急情况下，消防员执行了减速操作，以控制火势的蔓延。
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3.The scientist conducted a retarder operation to study the effects of gravity on objects in space.
科学家进行了减速操作，以研究重力对太空中物体的影响。