气体不同于固体是因为(就在于)它没有固定的形状。
婚姻的困难之处就在于：我们因为一个人的个性而爱上他，但又得和他的性格一起生活。
The difficulty with marriage is that we fall in love whit a personality, but must live with a character.
婚姻的困难之处就在于：我们因为一个人的个性而爱上他，但又得和他的性格一起生活。
The difficulty with marriage is that we fall in love with a personality, but must live with a character.
婚姻的困难之处就在于：我们因为一个人的个性而爱上他，但又得和他的性格一起生活。
The difficulty with marriage is that we fall in love with a personality, but must live with a character.
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