Sometimes in our life, we need to say something to the people around us. For example: healthy old people may want to tell polite young people that 'No need to give up your seat'; when you are busy working, you may want to tell others 'do not disturb'; when you meet someone at the station, you may need to tell the guest you don’t know 'I am here'...

'Chou Chee', hope Chou Chee ~^_^