自己对高度，下降率，以及滑行时间的估算不很准确。
I did not estimate the altitude and the rate of descent correctly and even did not calculate the glide time precisely.
潜油电动机滑行时间是评定电动机装配质量的重要指标。
The sliding time of the submersible electric motor is one of the important parameter for evaluating the assembling quality of the motor.
研究结果表明：运动员自由滑行时间和单支撑时间偏长，降低了蹬冰频率；
The result shows that if the athlete's slide time is too long, it will reduce the frequency of skating.
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