Meanings of constant upkeep in English

Thanks to constant upkeep it is in as good condition as ever.

Plus, full-suspension bikes require constant upkeep.

But the church needs constant upkeep, and when no one is looking, the rector, Mr. Montgomery, sees to it.

Seven staff help with the constant upkeep, which includes 22 air conditioners, 147 ceiling fans, 18 bathrooms and five suites for the couple's visitors.