n. 隧道;坑道;洞穴通道
vt. 挖;在…打开通道;在…挖掘隧道
vi. 挖掘隧道;打开通道
The "Tunnel of Love," an attraction found at many amusement parks, has been responsible for a surprising number of proposals. In this and similar devices, couples are allowed to drift through dark or semi-dark underground caverns, usually in a boat or gondola borne on an artificial stream of water. ... Their dim interiors often give a bashful young man the opportunity to propose. ["The American Magazine," July 1922]