智能手机是现代最有用的发明之一。

The smartphone is one of the most useful ___inventions in modern times.

灯泡的发明极大地改变了人类的生活方式。

The ___invention of the light bulb dramatically changed human lifestyles.

她声称自己发明了时间机器，但那只是编造的故事。

She claimed to have created a time machine, but it was just an ___invention.