The feed-forward block and two close-loop control methods effectively guarantee the calorific value adjusting quality of the burning gas supplying system.

系统采用前馈和双闭环的调整方法，有效地保障了池炉燃气供应系统良好的热值调节质量。

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Democrats outnumber Republicans in the Senate, but do not possess a majority large enough to block Republicans from using a procedural motion known as a filibuster to prevent a vote from going forward.

VOA: standard.2009.05.31

Troops moved forward block by block, hunting for cover behind crumbling mud-brick walls and houses.

CNN: 's Karl Penhaul

Damien Johnson headed over before Martin Skrtel's slip let in Paterson but Mucha rushed out to block the forward's strike.

BBC: N Ireland 0-2 Slovakia

Nine Democrats were in favor, but their colleagues voted en masse to block it from moving forward.

WSJ: Review & Outlook: The Gun Rights Consensus