If you are traveling the customs are really foreign to your own, please do as th

where引导地点状语从句，表示旅游到某个地方。where引导地点状语从句直接修饰动词，而在定语从句中where作为关系副词要跟在表示地点的先行词后面。in which引导定语从句。what用于引导名词性从句，在从句中作主语、宾语、表语。when引导时间状语从句，表示“当……的时候”。