Self-healed Scratches

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Practice Listening: Highlight Incorrect Words ID: #33485 Short Self-healed Scratches

Instructions ›

You will hear a recording. Below is a transcription of the recording. Some words in the transcription differ from what the speaker said. Please click on the words that are different.

* Click on the words that are different from what you hear

Result:

Correct Transcript:

If you get a scratch, your skin can heal itself. But if your car gets scratched, it stays scratched. Scientists at the university of Southern Missisippi think they may have solved that problem. They've developed a new material that can self-heal scratches when exposed to sunlight. They published this research in the March 13th issue of the journal Science. The new technology first takes polyurethane—the coating on many cars. Then researchers added chitosan—that's a key polymer in crab and shrimp shells. The final bit thrown into the mix are minute amounts of oxetane rings, with three atoms of carbon and one of oxygen. The researchers are trying to mimic natural processes. Here's how it works. When there's a scratch, damaging the molecule, the oxetane ring opens. It has two reactive ends. In sunlight, chitosan breaks into two chains and generates free radicals.

AI explanationShows the answer. Tap to open.

Printed "reality", the speaker says "university"

Explanation: Listen again to "the university of Southern". Click "reality" on the page, the spoken word is longer so listen to the whole word.

Printed "complementary", the speaker says "Missisippi"

Explanation: In the audio you hear "Southern Missisippi think they". Choose "complementary" from the page, the printed word is much longer than the spoken one.

Printed "venereal", the speaker says "material"

Explanation: Here the speaker says "new material that can". Select "venereal" on the page, both words start with different letters so listen from the start.

Printed "planets", the speaker says "scratches"

Explanation: The speaker says "that can self-heal scratches", not "planets". Mark "planets" on the page, that word makes no sense in this sentence.

Printed "pap", the speaker says "research"

Explanation: Listen for "They published this research". Click "pap" on the page, the printed word is much shorter than what you hear.

Printed "enameling", the speaker says "damaging"

Explanation: You will hear "damaging the molecule". Choose "enameling" on the page, the words start with different letters so listen from the first sound.

"polyurethane" matches the audio

Explanation: "polyurethane, the coating on many cars" looks technical and may confuse you. The speaker says it exactly as printed, so do not click it.

"chitosan" matches the audio

Explanation: "Then researchers added chitosan, that's a key polymer" has a rare word and may seem wrong. The speaker actually says it as printed, so do not click it.

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