该国向民主的和平转型受到了全国性的庆祝。

The country's peaceful ___conversion to democracy was celebrated nationwide.

太阳能涉及将阳光转化为电力。

Solar power involves the ___conversion of sunlight into electricity.

将机械能转化为电能是发电机的基本原理。

The ___conversion of mechanical energy into electrical energy is fundamental to generators.