In this state of fluctuation he made up his mind so far as this: he would manage so as to be able to go.英文原著 · 《A Woman-Hater》
It was in Oreville that Mr. Pettigrew had a valuable mining property, on which he employed quite a number of men who preferred certain wages to a compensation depending on the fluctuations of fortune. Rodney was among those employed, but although he was well paid he could not get to like the work. Of this, however, he said nothing to Mr. Pettigrew whose company he enjoyed, and whom he held in high esteem.英文原著 · 《Cast Upon the Breakers》
The fluctuations of the determinants hither and thither may thus be transformed into a lasting ascending or descending movement; and THIS IS THE CRUCIAL POINT OF THESE GERMINAL PROCESSES.英文原著 · 《Darwin and Modern Science》
The statement in this passage that "Darwin was well aware that ordinary variability has nothing to do with evolution, but that other kinds of variation were necessary" is contradicted by many passages in the "Origin". A.C.S.)) The latter afford the material for natural selection to act upon on the broad lines of organic development, but the first do not. Fortuitous variations are the species-producing kind, which the theory requires; continuous fluctuations constitute, in this respect, a useless type.英文原著 · 《Darwin and Modern Science》
Of late, the study of variability has returned to the recognition of this distinction. Darwin's variations, which from time to time happen to arise, are MUTATIONS, the opposite type being commonly designed fluctuations. A large mass of facts, collected during the last few decades, has confirmed this view, which in Darwin's time could only be expressed with much reserve, and everyone knows that Darwin was always very careful in statements of this kind.英文原著 · 《Darwin and Modern Science》
Thus we see that the theory of the origin of species by means of natural selection is quite independent of the question, how the variations to be selected arise. They may arise slowly, from simple fluctuations, or suddenly, by mutations; in both cases natural selection will take hold of them, will multiply them if they are beneficial, and in the course of time accumulate them, so as to produce that great diversity of organic life, which we so highly admire.英文原著 · 《Darwin and Modern Science》
I'd have to run the numbers, anticipate fluctuations, consider different models -- Your best guess.美剧 · 《House of Cards》
And this one is about hormonal fluctuations that can cause radical mood swings.美剧 · 《Modern Family》
"what is the force between two uncharged plates Due to quantum vacuum fluctuations?" Pms?美剧 · 《The Big Bang Theory》
But as far back as the 17th century, Scientists observed a 33-day fluctuation in men's hormone levels.美剧 · 《The Big Bang Theory》