A body is that being which hath these three dimensions, breadth, depth, and length; — or a bulk which makes a sensible resistance; — or whatsoever1 of its own nature possesseth a place.
Plato saith that it is neither heavy nor light in its own nature, when it exists in its own place; but being in the place where another should be, then it has an inclination2 by which it tends to gravity or levity3.
Aristotle saith that, if we simply consider things in their own nature, the earth only is to be judged heavy, and fire light; but air and water are on occasions heavy and at other times light.
The Stoics4 think that of the four elements two are light, fire and air; two ponderous5, earth and water; that which is naturally light doth by its own nature, not by any inclination, recede6 from its own centre; but that which is heavy doth by its own nature tend to its centre; for the centre is not a heavy thing in itself.
Epicurus thinks that bodies are not limited; but the first bodies, which are simple bodies, and all those composed of them, all acknowledge gravity; that all atoms are moved, some perpendicularly7, some obliquely8; some are carried aloft either by immediate9 impulse or with vibrations10.
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1 whatsoever | |
adv.(用于否定句中以加强语气)任何;pron.无论什么 | |
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2 inclination | |
n.倾斜;点头;弯腰;斜坡;倾度;倾向;爱好 | |
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3 levity | |
n.轻率,轻浮,不稳定,多变 | |
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4 stoics | |
禁欲主义者,恬淡寡欲的人,不以苦乐为意的人( stoic的名词复数 ) | |
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5 ponderous | |
adj.沉重的,笨重的,(文章)冗长的 | |
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6 recede | |
vi.退(去),渐渐远去;向后倾斜,缩进 | |
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7 perpendicularly | |
adv. 垂直地, 笔直地, 纵向地 | |
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8 obliquely | |
adv.斜; 倾斜; 间接; 不光明正大 | |
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9 immediate | |
adj.立即的;直接的,最接近的;紧靠的 | |
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10 vibrations | |
n.摆动( vibration的名词复数 );震动;感受;(偏离平衡位置的)一次性往复振动 | |
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