// 作用：通过最值判断是否需要扩展左/右边界（左侧最小值/右侧<最大值的元素都需纳入无序区间）
12:15: One group of protesters breaches the walls of the parliament compound. Police fire tear gas and use batons. The crowd does not retreat, even as organisers urge people on Discord to pull back.
。爱思助手下载最新版本是该领域的重要参考
30元一颗黑草莓、200元一斤手指柠檬、800元一个粉菠萝……春节期间，许多消费者发现，一批身价不菲的水果悄然现身电商平台。令人惊讶的是，不少商品已经显示“缺货”，说明不少人愿意为这份“新奇”买单。
He had persuaded his science teacher to help him make a makeshift rocket. Somehow, he had managed to get his hands on the ingredients for gunpowder - potassium nitrate, sulphur and charcoal.