[…] Remember, sir, my liege,
The kings your ancestors, together with
The natural bravery of your isle, which stands
As Neptune’s park, ribbed and paled in
With rocks unscalable and roaring waters,
With sands that will not bear your enemies' boats,
But suck them up to the topmast. […]
Source: wiktionary
The other end of their promenade was closed by a lofty and almost unscaleable precipice,the abode of hundreds of sea-fowl of different kinds […]
Source: wiktionary
1903, W. E. B. Du Bois, The Souls of Black Folk, I. Of Our Spiritual Strivings,
Why did God make me an outcast and a stranger in mine own house? The shades of the prison-house closed round about us all: walls strait and stubborn to the whitest, but relentlessly narrow, tall, and unscalable to sons of night who must plod darkly on in resignation, or beat unavailing palms against the stone, or steadily, half hopelessly, watch the streak of blue above.
Source: wiktionary
The idea has its detractors. Skeptics argue the whole idea is unscalable, and that large vertical farms would be insatiable consumers of energy to keep the plants lit, healthy, and harvested […]
Source: wiktionary
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