1) 翻译：我们难以理解“无条件的爱”意味着什么。
"Unconditional love" is hard for us to fathom.
更好：It's hard to fathom what it means to love someone unconditionally.
2) I really couldn't fathom what Robert was talking about.
3) 其他积累：
Jeremy's passive attitude was hard to fathom.
杰里米的消极态度令人费解。
