如果友谊一旦破坏了，连爱情也不能够再使它恢复。
If friendship once destroyed, even the love also can not make it back again.
历史文化资源，特别是物质文化资源是不可再生的资源，一旦破坏就无法挽回。
The historical cultural resources, especially physical cultural resources, can never be restored once they are damaged.
这是因为一旦破坏了表面的防锈漆，铁艺制品很容易生锈，所以在使用中发现漆皮脱落要及时用特制的“修补漆”修补，以免生锈。
This is because once the damage to the surface of the paint, rusty iron products easily, so use that paint off in time with a special "refinish" repair, to avoid rust.
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