A twin-engine airplane can continue to fly even if one engine fails.

He is the most appropriate for that job.

We have the appropriate equipment for mountain climbing.

The dual number does not exist in English grammar.

He encountered a wild deer in the forest.

I happened to encounter an old friend yesterday.

This factory operates 24 hours a day.

We started operating the new factory.

She added new decorations to the room.

She decorated the room for Christmas.