这是一个历史性的事件。

Now, this is a historical event.

youdao

这是一个历史性的事件，不仅因为其导致了社会的变动，而且因为这一事件很大程度上是通过社交媒体工具来带动的。

This was a historic event, not only for the resulting social change, but also because it was driven largely through social media tools.

youdao

一个前所未有的历史性的事件发生了。宇宙中是否只有我们生存的问题已经有答案了。

A historic and unprecedented event occurred. The question of whether or not we are alone in the universe has been answered.

youdao

Now, this is a historical event.

这是一个历史性的事件

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