这些岛屿位于千岛群岛的南端。The islands lie at the southern end of the Kurile chain.设得兰群岛是水獭在不列颠群岛上最后的栖息地。Shetland is the last stronghold of otters in the British Isles.他的尸体在离加那利群岛不远的海上被发现。His body was found at sea in waters off the C...
这些细胞称为内胚层细胞.These cells are known as endodermal cells.这些表皮细胞在胚胎学上把源于支气管生长过程中的前内脏叫内胚层.These epithelial elements arise embryologically from foregut endoderm in the process of bronchial tubular growth....