Brain teasers的意思是?

Brain teasers的意思是? Brain Teasers:When do people have two mouths? Brain Teasers:Why do giraffes have long neck? Brain Teasers:Why do lions eat raw meat? Brain teasers：Why is the pig always eating? Brain Teasers:What has a mouth but never speaks? Brain Teasers:What does everyone have and overlook? Brain Teasers:What time is it when the clock stikes sixteen? Brain Teasers:What room has no walls,no doors, no windows,and no one Brain teasers： What do you add to a road to make it wide? Brain Teasers 6Before Mount Everest was discovered, what was the highest mountain in the world? Brain Teasers:What number has nothing left if you take a half from it? Brain Teasers:What has everybody seen before but will never he seen 英语翻译brain control action ,but often we go follow the heart~这句话的意思是? Brain Teasers 8There was an airplane crash, every single person died, but two people survived. How is this possible? brain什么意思 英语单词brain什么意思 brain-dead什么意思?