next_a = soup.select_one("a.next")
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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In a field dominated by big name brands, consumers may be surprised to learn how many family-owned soft drinks firms remain in the US.
The Buds 4 Pro have a wide woofer that increases the effective speaker area by nearly 20 percent compared with the previous gen earbuds, Samsung said. They support 24-bit/96kHz audio.