中枢

私（わたし）はもっと敵（てき）の抵抗（ていこう）があると踏（ふ）んでたんだけど、むしろ中枢（ちゅうすう）に進（すす）むほど敵（てき）が減（へ）ってきてる・・・。おかしいと思（おも）わないかしら？

I had expected stronger resistance from the enemy but if anything there are less of them as we advance to the centre... Don't you think that's strange?