Sure. It is really only in the last 50 years that we have realized what harm we are causing to the natural environment.

当然。这是真的，只有在过去的50年里，我们才意识到我们所造成的自然环境的危害。

youdao

Sure. It is really only in the last 50 years that we have realized what harm we are causing to the natural environment.

当然。这是真的，只有在过去的50年里，我们才意识到我们所造成的自然环境的危害。

youdao