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Update docs/zh/faq/operations/delete-old-data.md

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@ -11,7 +11,7 @@ sidebar_position: 20
## TTL {#ttl}
ClickHouse允许在某些条件发生时自动删除值。这个条件被配置为基于任何列的表达式，通常只是针对任何时间戳列的静态偏移量。
ClickHouse 允许在某些条件发生时自动删除值。这个条件被配置为基于任何列的表达式，通常只是针对任何时间戳列的静态偏移量。
这种方法的主要优势是它不需要任何外部系统来触发，一旦配置了TTL，数据删除就会自动在后台发生。