正如之前对于事故的分析(包括BP自己的)所指出的，有问题的水泥灌浆作业致使石油进入到了本应密封的油井的底部，但这并不是全部的原因。
As previous analyses of the accident, including BP's own, have shown, the flawed cementing that let oil into the bottom of the supposedly sealed well was not the only issue.
为什么要对石材表面采取密封和灌浆处理？
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