Weylandt fell from his bike at high speed during a speed descent about 20km from Rapallo, where the tour's third stage ended.

在距离第三赛段终点拉帕洛只有20公里的地方，他从高速骑行驶的自行车上摔下来。

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It records "air data" such as the airplane's speed, heading, altitude, rate of climb or descent, accelerations, and decelerations.

它记录的飞行数据包括飞机的速度、航向、高度、爬升或下降速度、加速以及减速等。

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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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She added that as the course instructor concluded that the technique was so obvious that no demonstration was necessary, it was vital she should at least give clear and specific instructions about how to negotiate the pole, so as to control the speed of descent - but she did not.

BBC: South West Wales

The unemployment rate, which has repeatedly surprised economists with the speed of its descent, did so again: it fell to 8.3%, a three-year low, from 8.5%.

ECONOMIST: Employment springs to life; will it fade again?

On a downhill slope, get your speed low before you start the descent, and do not let it build up - it is much easier to keep it low than to try to slow down once things get slippery.

BBC: How to drive in snow and icy weather