latchkey的复数形式怎么拼写？

On the doorstep he felt in his hip pocket for the latchkey.他站在门口的台阶上,摸了摸后裤兜,找大门钥匙.Someone was opening the front door with a latchkey.有人在用门锁钥匙开前门.At nine o'clock I heard my uncle's latchkey in the hall door.九点钟时...

latchkey的音标：latchkey的英式发音音标为：['lætʃki:]latchkey的美式发音音标为：['lætʃˌki]...

n.闩锁钥匙，弹簧锁钥匙...