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There is certain expansion clearance between different parts of boiler and one another which can prevent deformation of heated surface due to restrained expansion.
锅炉各部件及相互之间有一定的膨胀间隙，可防止受热面由于膨胀受约束而变形。
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It made nose deformation and restrained growth of pig.
本病主要危害幼猪，造成鼻部变形，生长受阻。
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