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。

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One of the key technique problems is boundary dynamic contact constraint and contact judgment in FEA simulation for 3d complicated massive forming.

边界界面动态接触约束与接触判断是3维复杂体积成形有限元数值模拟的关键技术问题之一。

youdao

In the process of structure construction, the structural system, boundary constraint conditions and load distribution are constantly changing.

在结构施工过程中，结构受力体系、边界约束条件、荷载分布在不断的改变。

youdao

Given that, SNP ministers say, rUK ministers and the financial system would rationally prefer a stable sterling zone rather than Scotland deploying sterling free from constraint on their northern boundary.

BBC: Scottish independence: Political battle over currency