It was previously suggested that growth in the midribs might provide enough internal stress for the petals to burst out of their casing.

过去人们认为是花瓣中脉的生长产生了足够的内部张力让花瓣从花蕾中伸展开来。

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The inside (including the taper) is usually made of cement or thermoplastic, since this material must be drilled out if the well is to be deepened beyond the casing point.

浮鞋的内部（包括锥型段部分）通常由水泥或热塑性材料组成，如果在套管鞋处井眼还需要继续加深的话这种材料必须被钻掉。

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When the drawworks's electromagnetic brake is out of work in drilling or casing operation, serious accident will happen.

深井钻机在下钻或下套管作业中，绞车电磁制动一旦失灵可能造成严重事故。

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One analyst I spoke with suggested that it could be that the kick pushed newly poured cement out of the casing, gumming up the controls.

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Then one of the artists would try to distract the shopkeeper by buying a candy bar or chewing gum while the other slipped the poster out of its wire casing.

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Suffice to say, it feels well-built, which makes sense, as the casing is fashioned entirely out of aluminum.

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