这些簇射的范围非常广，在地面上都能较容易地观察到。
These showers can be so extensive; that they can easily be observed from the ground.
他不带绳索、钢锥或岩钉。除了在地面上的观察判断所得，他并不喜欢实地了解岩壁各处的状况。
He had no ropes, bolts or pitons, and preferably no knowledge of the ascent except what he had gleaned from the ground, telling himself "Dude, there's some holds here, man."
父亲跟我说过，有一台机器能把观察平台升起到地面上。
My father told me about a machine powerful enough to lift the observation platform right up to the surface.
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