/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: Belletehweiyih https://cdn.slidesharecdn.com/profile-photo-Belletehweiyih-48x48.jpg?cb=1523343022 Past is experience, Present is experiment. Future is expectation, use experience in your experiments to get expectation.