‘I know what I did, and more importantly, what I didn’t do,’ former US president says after six-hour deposition
缺点：容易饱和（输入过大或过小时梯度接近0，导致梯度消失）
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The team fired a laser that detected metal atoms released from the rocket body made of aluminium-lithium.
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（一）违反国家规定，侵入计算机信息系统或者采用其他技术手段，获取计算机信息系统中存储、处理或者传输的数据，或者对计算机信息系统实施非法控制的；