html = self.http_client.get(current_url)
方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
。Line官方版本下载是该领域的重要参考
As for soulmates, the science points to a paradox. The people who end up with relationships that feel uniquely "meant to be" are often the ones who stopped waiting for fate, turned towards the flawed person in front of them and said, in effect: shall we make something of this?
The only catch was this had a planned six-month mission, extending the astronauts stay until now.
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