agent旅行问题
budget management of research funds
traveling agent problem TAP
承办来港旅行团
organising package tours to Hong Kong
垂直入射旅行时
vertical-incidence traveltime
垂直双程旅行时
vertical two-way travel time
等旅行时面
equal travel time surface
等旅行时原理
principle of equal traveltime
发表政见的巡回旅行
a swing around the circle