Let's go to the park.-Great!But I need a bike.中的tneed在本句中是什么

Let's go to the park.-Great!But I need a bike.中的tneed在本句中是什么意思?
还有几局也要各位帮忙:
The car can;t move.Beca the wheel is broken.中的wheel是什么意思
My mother is a worker and my father is a cleaner.中的cleaner是什么思
Are you hungry?Eat this toast,please.的toast是什么意思
This book is thin.That book is thick.的thick是什么意思