A steep, high rock face, often by the sea

• A sheer drop in terrain

陡峭的高大岩壁，常在海边

• 地形的突然陡降

A point where something suddenly fails or drops sharply

• A critical threshold with abrupt consequences

某事物突然失败或急剧下跌的临界点

• 带来骤然后果的关键门槛