extendern.增量剂；扩充器；延长器extendv.延伸；延长；伸展；扩展；提供；使竭尽全力extended function扩充功能extend a contract延长合同(期)extendible nozzle延伸喷管extended strategy广义策略extended forecast中期预报extended meanings引申义extend a frontier扩张疆土extend one's arms伸出两臂extended warranty延长的保证期extend help to sb给某人帮助