n.[C]

1. 访问者；留住客；探病者
   Marty was a frequent visitor to our house.

   马蒂过去是我们家的常客。

2. 观光者；参观者
   There are many visitors to the White House every year.

   每年参观白宫的游客很多。

3. 视察者，检查者
4. 候鸟

n.

1. a person visiting a person or place.
2. Ornithology  a migratory bird present in a locality for only part of the year.