打井的英文表达是 to dig a well。例如:1. The farmers drove wells to water the crops. 农民打井灌溉庄稼。2. They are digging at physics. 他们在钻研物理学。3. What are they digging fo
世界知识产权组织(WIPO)的Patentscope网址:https://patentscope.wipo.int/search/en/search.jsf可以通过填写专利的国际申请号或发布号来搜索并下载专利文件,相对中文下载更方便。国家知识产权局(SIPO)网址:www.sipo.gov.cn可以