优点：计算简单，导数恒为1（正区间），缓解梯度消失
Trump reduced tariffs on Vietnam and removed that country from the United States’s export controls list after the Hanoi government approved his family business’s $1.5bn golf course and real estate project.
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This is Gear editor Julian Chokkattu's favorite scooter. The riding experience is powerful and smooth, thanks to its dual 350-watt motors and solid front and rear suspensions. The speed maxes out at 28 miles per hour (mph), which doesn't make it the fastest scooter on the market, but it has a good range. (Chokkattu is a very tall man and was able to travel 15 miles on a single charge at 15 mph.) Other Apollo features he appreciates: turn signals, a dot display, a bell, along with a headlight and an LED strip for extra visibility.