步进式加热炉的推钢机可以将整炉钢坯推着前进
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Wecanhear（）fromthebackoftheroom.
Breadandbutter（）likedbyWesterners.
Dr.Yangworked______threedaysago.
-Wehaven’theardfromJaneforalongtime.
-Whatdoyousuppose_____toher?
It’snecessary_________usallto________
