threshold
n
1 piece of wood or stone forming the bottom of a doorway 門檻.
2 entrance of a house, etc (房屋等的)門口
cross the threshold, ie enter 跨過門檻(進入).
3 (usu sing 通常作單數) (fig 比喻) point of entering or beginning sth 入門; 起點; 開端
He was on the threshold of his career. 他的事業剛剛起步.
at the threshold of a new era in medicine 醫學領域新時代的開端.
4 (medical or psychology 醫或心) limit below which a person does not react to a stimulus 閾
above/below the threshold of consciousness 閾上[下]知覺
have a high/low pain threshold, ie be able to endure much/little pain, eg during illness 有很高[低]的痛覺閾.