短语讲解：
1. It has become more and more popular for people to make plans for outdoor exploration based on their own interests.
base on使建立在…基础上
例句：Action should be based on solid facts.
行动应有确凿的事实为依据。
2. Some place invitations on the internet in an attempt to find travel companions.
in an attempt to力图,试图
例句：He studied hard in an attempt to pass the exam
他努力学习试图通过考试。
3. When you read through some of the outdoor activity websites online, it's easy to find a large number of such invitations.
