This microphone has less sound attenuation.

The sound gradually attenuates.

In this area, a large tank is needed to store rainwater during the rainy season.

We installed a tank to store rainwater.

This factory is treating wastewater with consideration for the environment.

He saved the children from danger.

He drank water.

She is like a pure maiden.

Please calculate the volume of this cone.

Today's precipitation was 50 millimeters.