體育專業(yè)外文翻譯3-其他專業(yè)(編輯修改稿)
2025-02-24 07:24 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 n our country, to design a practical, economic tennis ball launcher, let tennis lovers can be more fortable, more effective multi ball practice, is very necessary. By literature and online data survey: foreign to the tennis ball launcher research began relatively early, the earliest patent was 1998the United States Rose invention. Since then, many countries begin to put into the study, including the United States, Britain and Japan dominate, mature technology, and some products have been put into the market use. In addition, abroad on tennis return of service research to be much more delicate, except through the ground turn to flogging, increased driving speed in a series of action research, it is required to serve in the process, is the core force is more concentrated, gradually from further action to not step. Our country for such device research although start later, but in recent years has emerged in a lot of ideas, but did not apply for the national patent. At present our country most tennis transmitter manufacturers or the use of foreign tennis launch technology. Our country tennis emission technology neither advanced nor very matur
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