```python
def pounds_to_kilograms(pounds):
1磅等于0.45359237公斤
kilograms = pounds 0.45359237
return kilograms
def kilograms_to_pounds(kilograms):
1公斤等于2.20462262磅
pounds = kilograms 2.20462262
return pounds
用户输入
pounds_input = float(input("请输入英磅数: "))
kilograms_output = pounds_to_kilograms(pounds_input)
print(f"{pounds_input
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