periodical maintenance的用法和样例：
例句
- Carry out preventive maintenance throughout the hotel to ensure standards are maintained for guest comfort.
在酒店内履行全面的定期维护以保证维护客人舒适度的标准。 - 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.
自然色维护油和白色维护油适用于所有油面木地板的维护，特别适用于油面木地板的定期维护。
