He was trying, for some unknown reason , to count the stars.

不知何故，他试图数星星。

《牛津词典》

But for some unknown reason, this time the sound is very soft, as slight as a strand of silk, breaking off several times before once again picking up the thread.

可是这一次不知为什么，声音极低，绝细的一丝，几次断了又连上。

youdao

Huahua is usually very happy. However, when we were taking photos for her today, she cried for some unknown reason. But then she was OK again!

花花平时可高兴了，但是今天我们给她照相时她却突然哭了，不过很快就又好了！

youdao

The Republicans, for some unknown reason, decided to pass on fully emulating that system year.

FORBES: Obama's Not-So-Secret Weapon: Will He Use It to Help Power His New Mandate?

For some strange and unknown reason, the Small Business Administration has changed how it defines government support of small businesses, which will inadvertently destroy many small businesses, especially those supported through the Department of Energy.

FORBES: The Small Business Administration Decides to Hurt Small Businesses

For some unknown reason, it tries to force me to use Albany, NY as my departure airport for every search even though I do not live near Albany and have never flown in or out of the airport.

FORBES: Google Flights? Not Ready For Prime Time.