来自preserve,保护，保存。引申词义防腐剂。

1. The wood is treated with preservative to prevent decay.

这块木头用防腐剂处理过以防止腐烂.

2. Make sure the panels are treated with a wood preservative.

确保镶板用木材防腐剂处理过.

3. New timber should be treated with a preservative.

新采的圆木应进行防腐处理.

4. Salt is a preservative for meat.

盐是肉类的防腐剂.

5. Though the panels come pre-treated, they needed a final sealing with two coats of preservative.

虽然这些镶板运来时经过了预处理，但是还需要涂上两层防腐剂进行最后的密封。