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MTBF
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MTBF--MTBF(mean time between failures)
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sperm
sperm
sperm
sperm
sperm
spermaceti
spermaceti
spermaceti wax
spermadictyon
spermaduct
spermagglutinin
spermagonium
spermary
spermatangium
spermateleosis
spermatheca
spermatheca
spermatheca
spermathecal gland
spermathecal orifice
spermathecal tube
spermatic cord
spermatic cord
spermatic duct
spermatid
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