The sweep efficiency and oil displacement effect of polymer flooding in seven spot and five spot patterns for single and multizone reservoirs were simulated by numerical simulation.

用数值模拟研究手段对七点法井网、五点法井网以及单油层、多油层聚合物驱的波及系数及驱油效果进行了模拟；

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When the seven kids saw that, they came running to the spot and cried aloud,"The wolf is dead!"

七个孩子看到后，全跑到这里来大声叫道：“狼死了！”

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Most of the people come seven days a week, often to the same spot.

大多数人每周七天都来锻炼，而且常常是在同一个地点。

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The adult H. axyridis is about 7mm long, slightly larger than the seven-spot ladybird native to the UK. It comes in a range of colours and patterns.

BBC: NEWS | UK | Northern Ireland | Hunt on for 'deadly ladybird'

Villa are third in the league - only five points off top spot and seven points clear of fifth place.

BBC: Top four is the priority - Petrov

He reached his peak in the 1920s, winning his first U.S. Open title and holding the world number one spot for seven straight years.

CNN: Federer closes on Tilden's U.S. Open record