The drug potency of this medicine is very strong.

When spring comes, the birds in the park begin to copulate.

When spring comes, the birds begin to copulate.

She is suffering from menopause symptoms.

The new law has been officially announced.

The government has officially announced a new law.

We are working hard to build a new system.

We are working on the construction of a new system.

Aircraft carriers are an important part of the navy's strength.

We should aim for the optimization of our operations.