短语讲解：

1. Waterlogue is available for iPhone/iPad for under $4.

be available for 有效
例句：The ticket is available for three days.
这张票有效期三天。

2. Search for the place you want Google Maps for, such as Washington, D.C.

search for 搜索，搜寻; 访求
例句：The search for peace also means the search for justice.
寻求和平也意味着寻求正义。