This paper deals with how to make superfine silicon powder used for ignition composition by grinding mill with double rotating directions.
文章研究了用双向旋转球磨机制备硅粉超细粉体的技术,介绍了双向旋转球磨机粉碎原理,详细分析了双向旋转球磨机筒体及内搅拌器转速、球料比、研磨时间、磨球尺寸等工艺参数对硅粉超细粉体产品粒度影响。
Preliminary Approach to Teaching Pattern for Students to Master Batting Technique of Top Spin in Volleyball;
排球上旋球击打类技术教学模式初探
Assuming your driving the ball or hitting with topspin.
假定你用力击球或以上旋球打击。
To strike the upper part of(a ball), giving it forward spin.
上旋击球击打（球的）上半部分，使其向前旋转
The Study of the Teaching Method of the Theory of Transferable Skills in Playing Volleyball;
排球击打类技术运用技能迁移理论教学模式研究
A similar effect occurs with golf balls, which always have "backspin" from impact with the slanted club face.
球棒斜面打击高尔夫球时，常发生“后旋”，就是这种类似效应。
A forward spin on a ball resulting from such a stroke.
上旋上部击球形成的向前向上旋转
strike (the ball) in golf, tennis, or hockey obliquely downward so as to give a backspin or elevation to the shot.
在打高尔夫球、网球、曲棍球时用下旋手法击球。
On the Teaching of Last Ball Technique in Tennis;
浅谈网球底线正手上旋球技术教学的重点环节
Forward rotation imparted to a ball by a stroke, as in tennis.
上旋击球后产生的球向前旋转，例如在网球中
Investigation and Analysis on the Types of Playing Technique and Way of Table Tennis Team of Heilongjiang Province;
黑龙江省乒乓球队技术打法类型的调查分析
Investigation and Analysis on the Type of Playing Technique and Method of Playing Table Tennis for Children in Fujian Province;
福建省少儿乒乓球技术打法类型的调查分析
base hit;(in baseball)hit that enables a batter to reach first base
（棒球）安全打（使击球手能上第一垒的击球）.
] free pass [hit by pitched ball]
保送上垒[打击手被球击中
The bases were full when the slugger stepped up to bat.
强棒打击手上场击球时已是满垒
Johnson uses his double-handed topspin backhand drives and plays it back along the flight path of the service.
约翰反手抽上旋球，将球沿发球路线击回。
This paper suggests a new forehand“ pressing play” technique to cope with the loop drive.
在研究攻打、带弧圈球的基础上,提出了正手挤打弧圈球技术。
In ice hockey the players skate around the ice and try to make a goal with the puck.
冰上曲棍球比赛中, 球员在冰上周旋, 用球杆把球击入球门。
Ronald seems to know all kinds of serve techniques-the backhand topspin and backspin serves, the forehand topspin and backspin serves, and the high toss serves.
所有的发球技巧，罗纳德似乎都懂-----反手上旋球和下旋球、手上旋球和下旋球以及高抛球。