“折叶”的拼音？

他给吱吱作响的门折叶上了油.He oiled the squeaky hinges of the door.门的折叶需要上油了,每次开时, 它都发出嘎嘎的声音.The hinge of the gate needs oiling; it creaks every time it's opened....

“折叶”的英语可以翻译为：hinge ...