It's amazing that they were able to build a nest in such a tricky place!
How on earth did the swallows manage to build a nest on such a smooth wall?!
I'm amazed that the swallows built a nest in such a difficult place!
「こんな作りにくそうな場所に作るなんて凄い」= It's amazing that they were able to build a nest in such a tricky place! / How on earth did the swallows manage to build a nest on such a smooth wall?! / I'm amazed that the swallows built a nest in such a difficult place!
ボキャブラリー
amazing = 凄い、すばらしい
able to = ~ができた
build = 作る、建てる
nest = 巣
such a = そんな
tricky = トリッキー、難しい
place = 場所
how on earth = いったいどうやって~?
swallow = ツバメ
manage to 動詞 = ~ができる
smooth = ツルツル
wall = 壁
amazed = びっくりした
difficult = 難しい