He further confirmed that any requirements for obtaining trading rights would be for customs and fiscal purposes only and would not constitute a barrier to trade.
他进一步确认，获得贸易权的任何要求仅为海关和财政目的，将不构成贸易壁垒。
Retinal pigment epithelial (RPE) cells lie between the sensory retina and the choroids, constitute the outer blood retinal barrier and play a vital role in the retinal metabolism.
视网膜色素上皮(RPE)细胞位于视网膜感觉层和脉络膜之间，构成视网膜外屏障，在视网膜的代谢中起到重要的作用。
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