/ˈθreʃhəʊld ||; ˈθrɛʃhold/noun[C] 1 the ground at the entrance to a room or building 门坎；（建筑物的）入口
2 the level at which sth starts to happen 阈；临界: Young children have a low boredom threshold. 小孩子很容易厌倦。
3 the time when you are just about to start sth or find sth 开端；起点: We could be on the threshold of a scientific breakthrough. 我们可能很快要有科学上的突破。