threshold
n
1 piece of wood or stone forming the bottom of a doorway 门槛.
2 entrance of a house, etc (房屋等的)门口
cross the threshold, ie enter 跨过门槛(进入).
3 (usu sing 通常作单数) (fig 比喻) point of entering or beginning sth 入门; 起点; 开端
He was on the threshold of his career. 他的事业刚刚起步.
at the threshold of a new era in medicine 医学领域新时代的开端.
4 (medical or psychology 医或心) limit below which a person does not react to a stimulus 阈
above/below the threshold of consciousness 阈上[下]知觉
have a high/low pain threshold, ie be able to endure much/little pain, eg during illness 有很高[低]的痛觉阈.