To improve the drilling rate, the structure of stepped bit is optimized considering the structural dimension parameters as design variables and the maximum axial displacement as the object function,and then it is tested in field.
为提高冲击挤密钻进速度,以阶梯钻头的结构尺寸为设计变量,以钻头最大轴向位移为目标函数,对阶梯钻头结构进行优化,并进行了试验研究。
参考来源 - 基于ANSYS·2,447,543篇论文数据，部分数据来源于NoteExpress
It wobbled a bit, is what I mean, when you stepped on it.
我的意思是，当你站在上面时，会有点摇晃。
"Over a long, 20-year period, married men have stepped up to the plate a little bit, but not as much as married women have dropped off in the time they spend on household chores," Ms. Hartmann says.
“长达20年的时期以来，已婚男性慢慢地多做了些家务，而已婚女性对家中的琐碎事花的时间越来越少了，”哈特曼这么说。
Or worse... you were right in the middle of something, stepped away for a bit, and come back to find your computer has restarted itself because Windows Update decided to.
或者更坏的是……有多少次你正在忙什么东西，走开了一会，回来后发现你的电脑自己重新启动了因为Windows升级作出了这个决定。
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