His action is unforgivable.

He was tired, so I relieved him of driving.

He is involved in international trade.

He is trading on the stock market.

We need to adjust the descent speed of the helicopter.

The snow is falling quietly.

The story of Yugong is a symbol of effort and patience to overcome difficulties.

The public safety department is working day and night to ensure the safety of citizens.

The effect of this medicine is very powerful.

When his evildoing was revealed, everyone was surprised.