The float shoe also guides the casing toward the center of the hole to minimize hitting rock ledges or washouts as the casing is run into the wellbore.
当下套管时，浮鞋同样能够引导套管到井眼中心，减少套管对岩石突起或者井眼冲刷段的撞击。
The device guides the casing toward the center of the hole and minimizes problems associated with hitting rock ledges or washouts in the wellbore as the casing is lowered into the well.
该装置引导套管居于井眼的中心，减少下套管过程中套管撞击井眼内突起的岩石或井眼冲刷的地方。
He came upon a valley where rock ptarmigan rose on whirring wings from the ledges and muskegs.
他走到了一个山谷，那儿有许多松鸡从岩石和沼地里呼呼地拍着翅膀飞起来。
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