Spencer was preaching a full evolutionary doctrine in the year just before Darwin’s book was published, while most naturalists would have none of it.这个句子后半部分,即 while 后面的意思是?尤其是 would none of it,好像没有看过这种形式。
when falling at speeds up to 60 miles per hour, cats stretch their legs which increases their air resistance and reduces the shock of impact on hitting the ground.还有at speeds up to 中的up to 是:直到(达到)的意思吧