表面的曲率防止滑塌块完全脱离。
Curvature of the surface prevents slump block from becoming completely detached.
但对这些成功的满足感中仍然参杂着挫败感和更加强烈的感觉，那就是海军的威慑力量还不足以防止海盗脱离控制。
Yet satisfaction at such successes is mixed with frustration and an overwhelming feeling that naval deterrence is doing little more than prevent piracy from getting out of control.
引导讨论，并防止任何偏离主题或脱离主题的现象影响研讨会目标。
Guide the discussions and prevent any stray topics or tangents from interfering with the workshop's goals.
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