房子守恒定律 :-)

所有跟帖： 

• 我再次確認你是一個物理學家！ -方外居士- ♂ (0 bytes) () 11/14/2023 postreply 19:41:23

• I know he is a Phd, doctor of philosophy:)), not in physics. -暖冬cool夏- ♀ (0 bytes) () 11/15/2023 postreply 08:20:03

• The law of conservation of energy ? :)) -衛寧- ♂ (0 bytes) () 11/15/2023 postreply 07:10:00