The sentiment is probably assignable to the deep and aged roots which my family has stuck into the soil.

这可归因于我家人扎入土壤深厚而古老根。

He specifies above a dozen characters which may be found varying even on the same branch, sometimes according to age or development, sometimes without any assignable reason.

他指定了十几个字符， 即使在同一个分支上也可发现这些字符不同， 有时根据年龄或发展况， 有时没有任何可指定原因。

On the other hand, the new facts have brought new powers; man's physical control over natural forces has been increasing with unexampled rapidity, and promises to increase in the future beyond all easily assignable limits.

另一方，事实带来了力量；人类对自然力量物理控制一直在以前所未有速度增长，并有望在未来增长到超过所有容易指定限制。