In 1954, Jonas Salk obtained the first injectable vaccine against polio, while three years later, Willem Kolff developed the first artificial heart.
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Short, simple sentences with “injectable”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
In 1954, Jonas Salk obtained the first injectable vaccine against polio, while three years later, Willem Kolff developed the first artificial heart.
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