The main problem remains the same: how to codify a complex frame of reference.

其重点问题仍然是如何编纂出一个复杂的理论。

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This optimal strategy is quite complex and varies with the frame and the search costs.

最好的策略非常复杂，而且将根据价格设计和搜索成本的不同而改变。

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For this reason, the samara has no stationary frame of reference, unlike a two-winged helicopter, and appears to fall in a complex way.

因此，翅果没有稳定的参考结构，不像双翼直升机，并且它在降落中呈现出复杂的方式。

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An 18k white gold skeleton frame is designed as a complex set of gears, in reference to the 1936 film in which the Chaplin character struggles to survive in the modern, industrialized world.

FORBES: Writing Instruments As Objets D��Art

Through this process, the carpenter can determine all the components before they are built, however complex they are, and thus be sure that all the assemblies will fit together perfectly when the timber frame is built.

UNESCO: Intangible Cultural Heritage