In achieving his dream to be a rocket scientist, he would become an American hero. But it was not going to be easy.
圖像加註文字，格蕾絲·貝爾和史蒂文·鮑威爾帶著他們的兒子雨果Article InformationAuthor, 菲莉帕·羅克斯比（Philippa Roxby）
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"For a long time, roboticists have used DC [direct current] motors to make robots move," says Mike Tolley at the University of California San Diego.
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