These conclusions are of guiding significance for anti-wind and anti-earthquake design of this structure as well as the analysis of the anti-resonance of main and sub-main structures.

这些结论对该种结构抗风、抗震设计及主次结构共振分析具有指导意义。

youdao

Several of these flow into a branch sewer, which joins first a sub-main and then a main sewer taking it to the treatment plant.

这些街道污水管又相结一条污水支管。此支管与次干管连接，然后经主干管将污水送至污水处理厂。

youdao

Adversarial relationships between customers, main contractors and sub-contractors mean that design changes often cause rows and that problems are not tackled until they reach crisis proportions.

ECONOMIST: Are British builders uniquely awful?

Work to expand the refinery was sub-contracted by Total's main contractor - engineering firm Jacobs - to an Italian company, IREM, which decided to use its own foreign workforce.

BBC: Foreign labour row 'deal reached'

Until now, Montblanc's chronographs have featured traditional hour and minute hands on the main dial and smaller rotating disk sub-dials with stationary hands to measure elapsed minutes and seconds.

WSJ: The Face of Watchmaking's Future at SIHH and GTE