Sometimes the cannon is fixed in position, and other times you have to use the force of firing it to push it into a spot where you can hit the ball.
有时大炮是固定的位置，其他时候你必须使用发射它的力量把它推到一个你可以击中球的点。
The study was made by the research methods of taking fixed position high speed photographs on the spot, film analysis, mathematical statistics and so forth.
采用现场定点高速摄影、影片解析及数理统计等研究方法。
The study was made by the research methods of taking fixed position high speed photographs on the spot, film analysis, mathematical statistics and so forth.
采用现场定点高速摄影、影片解析及数理统计等研究方法。
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