extinguish
vt.熄灭，扑灭;使消亡，使破灭Please extinguish all cigarettes.请把所有的香烟都熄灭。
extract
vt.取出;提取;获得;摘录 n.摘录;提出物I’ve only seen short extracts from the film.我只是看过那部电影的部分片段。
hunt
n./ v.打猎;搜寻;驱逐，追逐，追捕the hunt for the missing child搜寻失踪儿童
hypothesis
n.假说，假设，前提One hypothesis is that the victim fell asleep while driving.一种假设是受害人开车时睡着了。
