But the evidence supporting the alpha constant's variable nature was ambiguous, because it could also be due to a variation over time, or across different parts of space, researchers said.

但研究人员说，支持alpha常数的变化性质的证据是模糊不清的，因为它可能是由于时间的变化，或者由于穿过了宇宙的不同部分。

youdao

The only real problem is alpha-transparency in true color PNGs, but then again, GIFs are not true color and don't support variable transparency either.

只有真正的问题是 alpha 透明度在真彩色 PNG，但又中 GIF 不是真彩色，也不支持可变的透明度。

youdao