One solution would be to use database-level checking constraints.

解决方案之一是用数据库级检测约束。

youdao

Block-level checking wouldn't work.

块级检查不工作。

youdao

On a simple level, think of a checking account without routing and account numbers.

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Unfortunately, many amateur landlords make the mistake of jumping into the pool head first without first checking the water level.

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"It is easy to imagine that some of these interruptions could have led to forgetting of steps, including checking the fuel level, performing the preflight, " said Bill Bramble, an NTSB aviation expert.

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