他在北海学会了潜水员这一行的本事。He learnt his trade as a diver in the North Sea.在北海突然发现了一支法国船队。A fleet of French ships was sighted in the North Sea.他们在北海遇到风暴，船险些失事。They narrowly escaped shipwreck in a storm in the North Sea....
在伤口中出现了胶原纤维.Collagen fibers appear in the wound.硬骨的基质既含有蛋白质的胶原纤维,也含有矿物质沉积.The matrix of bone contains both fibers of the protein collagen and mineral deposits.这种方法去除不了原纤维中含有的惰性植物性物质.This process does not remove the inert...