今天我们要学的词是runoff. runoff 是指竞选无法分出胜负的情况下进行的决选。Republican Cindy Hyde-Smith wins the Mississippi Senate runoff vote in an election that critics say was racially charged. 共和党人辛迪·海德-史密斯在密西西比州的参议院决选中胜出，批评人士说这次选举充满种族歧视。Runoff也指地表的水流，Surface runoff is the flow of water that occurs when excess stormwater, meltwater, or other sources flows over the Earth's surface. 地表径流是当多余的雨水，融水或其他来源的水流过地球表面时发生的水流。