有谁能讲解下beta-sheet和beta-bridge，我这边一片论文是这样描述的By contrast，the fraction of beta bridge ,which are defined as short beta-sheet-like segments of two residuesin length , remains near 5% of all residues in all simulations. Sincebeta-sheet are extended beta-bridges (as they involve more than two residues ),

有谁能讲解下beta-sheet和beta-bridge，我这边一片论文是这样描述的By contrast，the fraction of beta bridge ,which are defined as short beta-sheet-like segments of two residuesin length , remains near 5% of all residues in all simulations. Sincebeta-sheet are extended beta-bridges (as they involve more than two residues ),