直尺上钢珠的清晰度与直尺的倾斜角度有关，倾角过大即可产生模糊。
The clearness of the steel balls was related with the tilt Angle of ruler. A great tilt Angle resulted in blurring of the steel balls.
直尺上钢珠的清晰度与直尺的倾斜角度有关，倾角过大即可产生模糊。
The clearness of the steel balls was related with the tilt Angle of ruler. A great tilt Angle resulted in blurring of the steel balls.
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