求翻译：　　杨致和、张景田、王均照三人酷爱农用机械设计，从1998年开始对农用旋耕刨深耕机进行设计试验，先后投入设计经费共150万元，试验数百次，终于获得成功。是什么意思？

Wang Yang and Zhang Jingtian according to three people are fond of the design of agricultural machinery, deep plowing planing machine from the 1998 agricultural rotavator designed trials, funding for a total of 1.5 million yuan has been invested in the design, test hundreds of times, and finally suc