tags = [self._extract_text(tag) for tag in soup.select(".tags a")]
Discard old data — evict what's already buffered to make room
，这一点在91视频中也有详细论述
This surprises me. I have worked as a waitress in restaurants for more than five years, a job I love, and the joys of which most often come from the customers I serve. Of course, for every 10 great customers, you’re bound to get one that’s not so great – I’ve come across my fair share of those.
// 栈不为空时才判断（避免访问stack.at(-1)时报错）
至少，這項判決削弱了特朗普逼迫其他國家對美國讓步的籌碼，也讓他「無敵」的形象蒙上陰影。