根据例子写出下列单词的复数形式。Exaple: ear → ears
arm → __________ leg → __________ hand → __________
eye → __________ nose → __________ mouth → __________
toe → __________ finger → __________ knee → __________
shoulder → __________ elbow → __________arms, legs, hands, eyes, noses, mouths, toes, fingers, knees, shoulders, elbows