In other words, he was unwilling to treat this as anything but a concrete problem, and he was used to camels being in villages, and he was quite unable to use the hypothetical, to ask himself what if there were no camels in Germany.
つまり このことを彼は 具体的な問題としてしか考えられず 村にラクダがいることに 慣れている彼には 仮定を使い ドイツにラクダはいないものとして 問題に取り組むことが できなかったのです