periodical maintenance的用法和樣例：
例句
- Carry out preventive maintenance throughout the hotel to ensure standards are maintained for guest comfort.
在酒店內履行全面的定期維護以保證維護客人舒適度的標準。 - Maintenance oil Natural and White may be used for the maintenance of all oiled wood surfaces and is especially suitable tor the regular maintenance of oiled wood floors.
自然色維護油和白色維護油適用於所有油麵木地板的維護，特別適用於油麵木地板的定期維護。
