This is more distinctly proved from observations of the sea and sky, for here the evidence of the senses and common observation is alone requisite. The convexity of the sea is a further proof of this to those who have sailed, for they cannot perceive lights at a distance when placed at the same level as their eyes, and if raised on high they at once become perceptible to vision though at the same time farther removed. So when the eye is raised it sees what before was utterly imperceptible. Homer speaks of this when he says:英文原著 · 《A History of Science-1》
He returned to her, and had the unspeakable joy of seeing her wag her tail with an almost imperceptible movement at his approach. He sat down then, without fear, by her side, and they began to play together; he took her paws and muzzle, pulled her ears, rolled her over on her back, stroked her warm, delicate flanks. She let him do what ever he liked, and when he began to stroke the hair on her feet she drew her claws in carefully.英文原著 · 《A Passion in the Desert》
Unhappy creatures, accustomed to raise their eyes to heaven, in mute appeal against the bitterness of their lot, would have seen at once from her eyes that she was broken in to the cruel discipline of ceaseless prayer, would have discerned the almost imperceptible symptoms of the secret bruises which destroy all the flowers of the soul, even the sentiment of motherhood.英文原著 · 《A Woman of Thirty》
Well-bred people, and women especially, only betray their feelings by imperceptible touches; but those who can look back over their own experience on such bruises as this mother's heart received, know also how the heart-strings vibrate to these light touches. Overcome by her memories, Mme. d'Aiglemont recollected one of those microscopically small things, so stinging and so painful was it that never till this moment had she felt all the heartless contempt that lurked beneath smiles.英文原著 · 《A Woman of Thirty》
They looked attentively at some almost imperceptible object, far off on the horizon, some faint smoke rising from the waters like a tiny jot of another gray tint slightly darker than the sky's. Their eyes were used to plumbing depths, and they had seen it.英文原著 · 《AN ICELAND FISHERMAN》
Suddenly there was an almost imperceptible rumbling, which came from below, accompanied by a grinding sensation, as when a brake comes hard down on carriage wheels. The /Marie/ ceased all movement. They had struck. Where, and on what? Some bank off the English coast probably. For since overnight they had been able to see nothing, with those curtains of mist.英文原著 · 《AN ICELAND FISHERMAN》