(252/1. The correspondence with Professor Hyatt, of Boston, U.S., originated in the reference to his and Professor Cope's theories of acceleration and retardation, inserted in the sixth edition of the "Origin," page 149.英文原著 · 《More Letters of Charles Darwin Volume I》
I confess that I have never been able to grasp fully what you wish to show, and I presume that this must be owing to some dulness on my part...As the case stands, the law of acceleration and retardation seems to me to be a simple [?] statement of facts; but the statement, if fully established, would no doubt be an important step in our knowledge. But I had better say nothing more on the subject, otherwise I shall perhaps blunder again. I assure you that I regret much that I have fallen into two such grave errors.英文原著 · 《More Letters of Charles Darwin Volume I》
There is certainly no occasion to apologise for not having quoted my paper. The law of acceleration and retardation of development was therein used to explain the appearance of other phenomena, and might, as it did in nearly all cases, easily escape notice.英文原著 · 《More Letters of Charles Darwin Volume I》
the differences between the successive species, expressed by the terminal letter, was due to acceleration: now, if I understand rightly, this is not the case; and such characters must have been independently acquired by some means.英文原著 · 《More Letters of Charles Darwin Volume I》
(255/1. After speaking of Cope's comparison of acceleration and retardation in evolution to the force of gravity in physical matters Mr. Hyatt goes on:--)英文原著 · 《More Letters of Charles Darwin Volume I》
Now it [acceleration] seems to me to explain less and less the origin of adult progressive characteristics or simply differences, and perhaps now I shall get on faster with my work.英文原著 · 《More Letters of Charles Darwin Volume I》
No, you don't understand-- during acceleration, It needs to stay perfectly level and provide...美剧 · 《The Big Bang Theory》