For the carpentry constraint, note that it's also an upper boundary.
对于木工约束来说，注意它也有一个上界。
Next comes the tropopause, which is the upper boundary of the troposphere.
其上是对流层顶，它是对流层的上部边界。
This means that database manager automatically determines the upper boundary on memory consumption.
这意味着数据库管理器自动确定内存使用的上限。
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