momentary

她脸上闪过一丝短暂的惊讶。

There was a ___momentary look of surprise on her face.

他感到一阵短暂的眩晕，很快就恢复了。

He experienced a ___momentary dizziness but quickly recovered.

太阳被云遮住时，光线出现了短暂的减弱。

The sunlight dimmed in a ___momentary shadow as the cloud passed by.