① ある現象が起きるために最小限必要な値。ある現象が起き始める点。② 神経細胞など生体の興奮を引き起こすために最小限必要な刺激の強さ。
having a high threshold (for entry); difficult to approach; feeling awkward to go to (of someone's home)
window-sill; window-ledge
threshold gate; threshold element
threshold gate; threshold element