（一）承运人因客观条件无法满足托运人的要求，或者满足此种要求将影响承运人正常营运；
In an analysis by energy consultancy Wood Mackenzie, researchers noted that the nearest historical analogue would be the 1970s, when an oil supply crisis sparked downturns in several countries around the world. Unlike that period, however, the world is now much less reliant on oil, the analysts noted. To create a similar scale of global economic crisis, they wrote, oil prices would need to reach around $200 a barrel.
。51吃瓜对此有专业解读
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在外在形态上已经没有这条底线的情况下，底线仍然存在于天下人心当中，有这条看不见摸不着的底线，这个时代才有可能被终结，走向一个良性的太平年景，恢复相对文明形态的社会。