E

    Have you watched the TV show Home With Kids（《家有儿女》）？You may hear many people make the sound of "Hahahahaha!" when something funny happens. But every time, the laughter(笑声) sounds the same.

    This is canned(录音的) laughter. US sound engineer Charley Douglass made it in the 1950s. He recorded(录音) different kinds of laughter. When editors needed certain laughter, he just pressed the play button(按钮).

    Canned laughter was popular during that time. When audiences(观众) heard it, they laughed with the actors.

    But about 10 years later, some people thought canned laughter sounded silly. They wanted real laughter because it is more vivid（生动的）。Some famous sitcoms, such as Friends and the Big Bang Theory (《生活大爆炸》),use this kind of laughter.

    The Big Bang Theory sells tickets to audience around the world. They can join the live recording. All the laughter you hear is from the real audience!

    So which kind of laughter do you like?