... hollow back 脊柱前凸 hollow foot 凹足 holoacardius 无心寄生胎畸胎 ...
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The finished five-pound foot was a single-piece construction, hollow (to minimize weight) and with no seams or fasteners.
FORBES: Design A New Foot If The Shoe Does Not Fit -- Laser Sintering a Prosthetic Leg
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