The balloons dissolved high in the sky.

气球在高空中消失。

The sounds fainted away in the distance.

声在消失。

The shapes faded (away) into the night.

这些形象在夜色中消失。

Your hunger decreases as you eat.

饥饿感在吃饭时会消失的。

The laughter died down.

声消失了。

The noise gradually faded away.

喧闹声消失了。

When you turn on a transistorized radio, the sound comes on immediately; when you turn off, it fades out gradually.

打开晶体管收机, 立刻就有声, 关掉它时, 声消失。