Although drawn downwards by the heavy weight which hastened his rapid descent, it seemed to him as if the fall lasted for a century.

有重物拖着他，加快了他下降的速度，但他仍觉着下落的时间似乎持续了一百年。

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However, BP network with gradient descent has some defects such as low convergence speed, fall in local minima.

然而基于梯度下降的BP网络存在收敛速度慢、易陷入局部极小的缺陷。

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The descent stage has eight rocket motors on its corners. These will slow its fall to a relatively sedate 0.75 metres a second.

下降段底部四周装有8个火箭发动机，能使下降速度达到每秒0.75米的稳定速度。

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Less than a week later, a 36-year-old Finnish mountaineer also died from injuries sustained in a fall during descent.

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