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Cement was {{U}}seldom{{/U}} used in building the Middle Ages.

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crudely  rarely  originally  symbolically  
is water  are materials such as explosives which may be ignited by ignition sources  is sawdust to be used  cement may be used"  
slightly  rarely  originally  occasionally  
will have risen  has risen  will be rising  has been rising  
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硅酸盐水泥  通用水泥  胶凝材料  混凝土  
crudely  rarely  originally  occasionally  
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crudely  rarely  originally  occasionally  
crudely  rarely  originally  occasionally  
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a pipe with welded connections  a pipe with several clips  a cement box  a leaking valve  

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