The only clear explanation is that humans caused the extinction of the various mammal species through excessive hunting.

唯一明确的解释是人类的过度捕猎导致了各种哺乳动物的灭绝。

youdao

The only plausible explanation is that he forgot.

唯一合理的解释就是他忘掉了。

《牛津词典》

That may be two-bit psychology, but it's the only explanation I have.

那可能是不值一提的心理，但它是我唯一的解释。

《柯林斯英汉双解大词典》

That is the only explanation for the relative calm on the market for U.S. government bonds.

FORBES: Gold Is Truth, Unchained CPI Leads To A Dog-Food Diet

In the end, the only explanation that fit the data was that Mercury at one time had an ocean of magma on its surface.

FORBES: Mercury May Have Once Had An Ocean Of Lava

Although the government Mr Blair heads has been at least adequately competent, that is only part of the explanation for New Labour's continuing ascendancy.

ECONOMIST: Bagehot: Whatever works | The