#應付機械磨損
#應付張力
#改變材料特性
#防止變形
#Manage mechanical wear
#Manage tension
#Modify material characteristics
#Prevent deformation
堅硬而可延展的線 (Threads have hard flexible coating)
淡菜的足絲透過角質層外犧牲性交叉鏈接而同時具備堅硬性及可伸展性
(The byssal threads of mussels display both hardness and extensibility thanks to sacrificial cross-links in the outer cuticle.)