1. 推广服务：explant 外植体 | extension service 推广服务 | extrusion-blowing process 吹压工艺

2. 推广工作.推广机构：推广研究 Extension research | 推广工作.推广机构 Extension service | 推广专家 Extension specialist

3. 服务：explant 外植体 | extension service 服务 | extrusion-blowing process 吹压工艺

4. 推广站：extension service 推广站 | flood prediction service 洪水预报机构 | flood warning service 洪水警报机构,防汛机构

2. extension service的解释

noun

1. an educational opportunity provided by colleges and universities to people who are not enrolled as regular students

Synonym: extensionuniversity extension