Many players establish trade routes between certain buildings which they maintain regularly.

The recycling pit created by the students is regularly maintained.

Until around 1861 the caves were regularly maintained - even painted.

You need to ensure that all equipment is well maintained and checked regularly.

It is regularly maintained and used for most services.

Maintenance - all equipment must be regularly maintained and replaced.

It is insufficient to show that the brakes were regularly maintained.

An aquarium must be maintained regularly to ensure that the fish are kept healthy.

The garden was regularly maintained until the 1920s after which it fell into great disrepair.

The flood control channel was not maintained regularly, presumably for those reasons.