总和电位,增合电位summative: 总结性summationofgeometricprogression: 几何级数求和summative assessment: 总结性评估; 总结性评价; 总结性评量summationmeter: 总和计summative evaluation: 总结性评价; 总结性评量; 总括评价下载手机词典可随时随地查词查翻译