丝也有许多不同的形态，例如由于辐射状的丝网和环状的丝网的应力和应变不同，它们有着不同的组织结构。
Silk also comes in a variety of forms; the radial strands of a web, for example, have a different composition from the circumferential ones because the stresses and strains on them are different.
环状胰腺是指胰腺组织环绕十二指肠降段。
Annular pancreas refers to pancreatic tissue enveloping primarily the descending duodenum.
雄球花序中的不育胚珠和雄球花以及雌球花序中的胚珠均起源于环状总苞基部的分生组织。
The abortive ovules and male flowers in male cone inflorescence and the ovules in female cone inflorescence are originated from an annular meristem which differentiates from the base of each collar.
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