In the vacuum of space, the amount of debris—spent rocket stages, splintered satellites, micrometeoroids—numbers in the millions, all zooming about, often at 17,000 mph speeds. They’re also constantly hitting each other in a tsuris of exponential littering. Most of these pieces are tiny, and many are not anywhere near the altitude of the ISS. But the area isn’t completely clean.
优点：计算简单，导数恒为1（正区间），缓解梯度消失
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Yet Gabb points out that woven through the sweetness are money worries, family obligations and a history of depression that the couple are learning to manage together.
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