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Accurate prediction of earthquakes still needs to take more years.

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Because the weather in England is so variable.  Because the common man in England has as much knowledge about weather as the weathermen.  Because by lunchtime there could be thunder and lightening in England.  Because English weather always defies forecast.  
had been    was    has been    were  
reporting  measuring  recording  prediction  
Dangers of Earthquakes.  Earthquake Belts and Prediction.  Earthquake Prediction and Control.  Earthquake Engineering in California.  
It is becoming more accurate.  It is more accurate than the biological sciences.  It is more accurate than some of the measurements of structural engineers.  It is relatively inaccurate.  
Never.  Always.  Usually.  Occasionally.  
It is becoming more accurate.  It is more accurate than the biological sciences.  It is more accurate than some of the measurements of structural engineers.  It is relatively inaccurate.  
the skill of the scientist  the extent to which variables can be controlled  the requirements of the observer  the development of more accurate instruments  
ships figure was more accurate  ill of lading figure was more accurate  oth ships figure and bill of lading figure have the same accuracy  neither ships figure nor bill of lading figure is accurate"  
the skill of the scientist  the extent to which variables can be controlled  the requirements of the observer  the development of more accurate instruments  
strange behaviours of animals.  changes in the content of mineral water.  the magnetic properties of rocks.  dramatic change in climat  
Never.  Always.  Usually.  Occasionally.  

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