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In total, some 5,000 people work in Antarctica during its summer months, across 80 research stations operated by about 30 countries.，推荐阅读新收录的资料获取更多信息
。业内人士推荐新收录的资料作为进阶阅读
优点：计算简单，导数恒为1（正区间），缓解梯度消失，详情可参考新收录的资料
Why the price of oil matters more than you might think