在过去的30年里，人们的生活发生了巨大的变化。
In the last 30 years, great changes have taken place in people's life.
许多年前人们发现了电，电的发现使人们的生活发生了巨大的变化。
Many years ago, electricity was discovered. The discovery made people's life changed a.
许多年前人们发现了电，电的发现使人们的生活发生了巨大的变化。
Many years ago, electricity was discovered. The discovery made people's life changed a lot.
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