Over time Nansen came to "laugh at the ice; we are living as it were in an impregnable castle."
随着时间的推移，南森开始“嘲笑冰层”，说“我们就像住在一座坚不可摧的城堡里。”
The lofty walls of the castle seemed impregnable.
这座城堡的高墙似乎坚不可摧。
So he shut himself up in his castle, whose impregnable strength was such as defied a siege.
所以他把自己关在他的城堡里，那城堡盖得牢不可破，经得起围攻。
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