External doors should be of robust construction.

【construction】外门应该是结构坚固的。

Designing products with durability in mind requires a focus on robust construction, reliable components, and thorough testing to ensure a longer lifespan.

在设计产品时要考虑耐用性，需要关注坚固的结构、可靠的组件和彻底的测试，以确保更长的使用寿命。