YOU SAID:

Mankind has been around for a quarter of a million years yet the last 4,000 have been of any significance.

INTO JAPANESE

人類は、まだ最後の 4,000 任意の意義されて 100 万年の四分の一の周りされています。

BACK INTO ENGLISH

Human beings are still the last 4000 of any significance, has been around for a quarter of 1 million years.

INTO JAPANESE

人間はまだ任意の意義の最後の 4000、100 万年の四分の一の周りされています。