boulder fall
常见例句
- Slope failures including landslide and boulder fall occur every year in Hong Kong during the rainy season on man- made slopes.
香港城区的人造斜坡上每年雨季都要发生滑坡、落石等地质灾害，危及市民的生命财产安全。 - Given political and economic tensions, however, one wonders if these efforts, however commendable, face the same task as Sisyphus, the tragic figure of ancient Greek myth—rolling an immense boulder up a hill, watching it fall down and repeating the action for eternity as punishment for his transgressions.
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