n. 门槛( threshold的复数形式 ); [物理学]临界值; [英国英语]级限协定; [航空学]跑道入口
英文释义
n. the starting point for a new state or experience
n. the smallest detectable sensation
n. the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close