They were flying so high already that the thunder of those falls could only just be heard as a small, thin sound, but they were not yet high enough to fly over the top of the cliffs.

他们已经飞得很高，瀑布雷鸣般的巨响已变得很轻。但他们飞行的高度还不能越过峭壁。

youdao

They were flying so high already that the thunder of those falls could only just be heard as a small, thin sound, but they were not yet high enough to fly over the top of the cliffs.

他们已经飞得很高，瀑布雷鸣般的巨响已变得很轻。但他们飞行的高度还不能越过峭壁。

youdao