“yolk sac”的概念、定义、翻译、参考文献-科学参考

单词	yolk sac
释义	yolk sac [`yōk ´sak] ^EMBRYOLOGY A distended extraembryonic extension, heavy-laden with yolk, through the umbilicus of the midgut of the vertebrate embryo.
随便看	pulse demodulator pulse discriminator pulsed laser pulsed light pulsed-light ceilometer pulsed-light cloud-height indicator pulse-Doppler radar pulsed oscillator pulse dot soldering iron pulsed reactor pulse droop pulsed ruby laser pulsed transfer function pulse duration pulse-duration coder pulse-duration discriminator pulse-duration modulation pulse-duration modulation-frequency modulation pulsed video thermography pulse-echo method pulse form pulse-forming network pulse-frequency modulation pulse-frequency spectrum pulse generator

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