From what i understand , though , twtr is strong in the in - home install biz ( it is increasing the number of employees in this area by 25 % this year ) , which is a higher margin area that electronics retailers are increasingly looking to get into to boost growth 但是，从我的理解来看， twtr在室内安装领域拥有优势(今年该公司在这一业务领域增雇了25 %的员工) ，这是一个高盈利领域，电子产品零售商对此也日益关注，希望藉此推进其成长。
In the following several chapters , the paper introduces the main design procedures , including " selecting the scheme " , " calculating the parameters of technique specialty " , " the constitution and characteristic of the driller " , " the design calculation and calibration of the crucial parts " . then discusses the drilling technology and introduces the work principle , the complexion of the sampler drill " s installation and testing . at last , the paper generalizes the design and the experimentation , points out the next target 分“总体方案的选择” 、 “技术特性参数的确定” 、 “钻机组成和特点”以及“关键部分结构的设计计算和校核”几个部分；然后是钻进工艺的讨论，并介绍了三套取心钻具的工作原理以及室内安装、调试、实验的情况；最后总结了本次设计及实验情况，并指出下一步的努力方向。
