This is a reversal thinking operation concept against the pipe drilling method of casing pipe wall protection described in conventional books.

本方法与书本上所述的套管护壁跟管钻进方法有反向思维操作概念。

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North Africa necessitated a complete reversal in our thinking.

进攻北非的决定，要求我们在思想上完全转变。

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The decision to invade North Africa necessitated a complete reversal in our thinking.

进攻北非的决定，要求我们在思想上完全转变。

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He called the reversal "a real step in the right direction, " but said he was still thinking about dropping the online-video service because of the cost.

WSJ: Netflix Abandons Qwikster Plans