所谓底线,原指足球、篮球、羽毛球等运动场地两端的界限,引申后指人们社会活动范围不能超越的界线,是人们在社会实践活动中对于某一种事态心理可以承受或能够认可的阈值下限和最低要求。如履薄冰、如坐针毡、如临深渊、悲观决策、宁可备而不用、不可用而不备、凡事预则立、不预则废, The so-called bottom line, originally refers to the boundaries of football, basketball, badminton and other sports venues at both ends of the extension refers to the range of people’s social activities can not be beyond the boundaries of people in social practice activities for a certain kind of psychological can withstand or can recognize the lower threshold And the minimum requirements. Treading thin ice, such as pins and needles, such as the abyss, pessimistic decision-making, preferring to prepare instead, not available and not prepared, everything preconceived, without prejudice,