搜集 - you mean 'collection" as a hobby?
If that's the case,you can say something like,
"most people like to collect something" - stamps,coins,books...
Explain why people like to collect
What have people collected
How can they be useful (value?personal enjoyment?or even for public enjoyment as in a museum)
Alternatively,you can talk about your own collection -
What do you collect?
why do you collect?
How did you get your collection?
talk about some of the rare collections...
Shouldn't be too difficult...