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  • Narrator: WHEN YOU'RE HUNGRY,

  • YOU NEVER QUITE HAVE THE RIGHT COINS

  • FOR THE SNACK YOU WANT.

  • HOW DOES THE MACHINE KNOW TO SEND BACK ANYTHING FAKE

  • AND KEEP TRACK OF HOW MUCH YOU'VE PAID?

  • THE MACHINE DECIPHERS COINS WITH PINPOINT ACCURACY.

  • LIGHT SENSORS MEASURE THE SIZE,

  • AND ELECTROMAGNETS DETECT THE METAL TYPE,

  • IDENTIFYING THE COINS IN SPLIT SECONDS

  • AND SORTING THEM INTO COLUMNS,

  • DIVERTING FAKES TO THE REJECT CHUTE.

  • WHEN CHANGE IS DUE,

  • THE COLUMNS CAREFULLY RELEASE ONE COIN AT A TIME...

  • ...TUMBLING INTO THE CHUTE.

  • THESE 85 PARTS WORK TOGETHER

  • TO COUNT 15,000 COINS A YEAR

  • AND RELEASE YOUR SNACK AT THE TOUCH OF A BUTTON.

  • BUT WHEN YOU'RE HUNGRY,

  • THERE'S NOTHING MORE FRUSTRATING THAN YOUR SNACK GETTING STUCK.

  • HOW DO TODAY'S GENERATION OF VENDING MACHINES

  • MAKE SURE YOU GET YOUR TREAT EVERY TIME?

  • HIDDEN BEHIND THE KEYS,

  • A COMPUTER ORDERS 1 OF 32 MATCHBOX-SIZED MOTORS...

  • ...TO TURN THE SPIRAL 360 DEGREES.

  • AS THE SNACK FALLS,

  • IT BREAKS A LINE OF 10 INFRARED BEAMS.

  • IF NOTHING CROSSES THE BEAMS,

  • THE COMPUTER MAKES THE COILS TURN AGAIN.

  • WITH THIS INGENIOUS TECHNOLOGY, YOU'LL ALWAYS GET YOUR SNACK

  • AND NEVER LEAVE HUNGRY.

Narrator: WHEN YOU'RE HUNGRY,

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B2 中上級

自動販売機はどのようにして偽物のコインを検出するのか? (How Do Vending Machines Detect Fake Coins?)

  • 140 12
    Regina Chen に公開 2021 年 01 月 14 日
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