例句與造句

1. FSM programs can be drivers of sanitation improvement by encouraging OSSF upgrades that reduce the frequency of desludging events, and therefore the costs.
2. For municipal wastewater the use of septic tanks and other On-Site Sewage Facilities ( OSSF ) is widespread in some rural areas, for example serving up to 20 percent of the homes in the U . S.
3. It's difficult to find ossf in a sentence. 用ossf造句挺難的