“head shield”的概念、定义、翻译、参考文献-科学参考

单词	head shield
释义	head shield Geology and Earth Sciences 1. The term sometimes applied to the cephalon in trilobites (Trilobita). 2. The dorsal head covering of solid bone which occurs in many ostracoderms (Ostracodermi) (agnathan fish, see agnatha).
随便看	pharynx phase phase angle phase angle(symbol: ϕ) phase boundary phase centre phase change phase-change coefficient phase-change inkjet printer phase constant phase-contrast microscope phase corrector phased array phase defect phase delay phase-detect autofocus system phase detector phase deviation phase diagram phase difference phase discriminator phase distortion phased linear array phased retirement phase-encoded

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