关键操作和临界状态是指能够引起对人员所造成重大伤害，造成船舶损坏，货物或其它的财产和环境的损坏的重大危险的操作。
Critical Operations and Conditions are those which have a significant risk of causing major injuries or illness to people, or damage to ship, cargo, other property and/or the environment.
临界点-穿越未完整重建的损坏桥梁。
Threshold - Cross the broken bridge without completely rebuilding it.
观察那一编号的蜡条并不损坏纸的表面，就可确定纸的抗剥性。这个编号称为“临界蜡号”。
By observing the designation number or the wax that does not disturb the surface of he paper, the pick resistance of paper is determined. This number is called the critical wax number.
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