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Pronunciation Guide
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Listen to native speakers pronounce “hard hat” in real conversational contexts with synchronized timestamps and subtitles.
And they were taking grave risk. Haldane -- I don't know if, Haldane was the fellow who pioneered the real understandings of --for hard hat divers and for people who worked in bridge caissons, anybody who was working under pressure was susceptible to the bends.So there had been some research on this. And they had primitive dive tables but Cousteau refined them, he and the others who worked with him.