The results could simply be due to chance.

这结果可能纯属意外。

The problem may be due to poor workmanship.

问题可能是出在拙劣的工艺上。

It might be due to the Halloween weekend, but the picture reminds me of the this image.

可能是因为周末是万圣节，但图片让我联想到了这个的画面。

The valve failing closed could be due to an internal blockage or failure.

阀门无法关闭的原因可能是内部堵塞或故障。

This could be due to inflation.

这个可能归因于通货膨胀。