His respiration grew fainter throughout the day.

一天当中，他的呼吸越来越微弱。

We could hear their voices growing fainter as they walked down the road.

他们沿路走远时我们听见他们的说话声逐渐模糊。

Its parent star is a red dwarf--a far smaller and fainter object than the sun.

其母体恒星就像是一个红色的小矮人——比起太阳来实在是又小又模糊。

The sounds grew fainter.

声音渐渐微弱。

The beating of his heart grew fainter.

他的心脏跳动越来越无力了。