但真正的问题是，理想模型往往建立在需求高峰与利用率饱和的假设之上。而真实世界中的利用率，从来不会长期维持在高位。
Petrochemicals – of which plastics are the dominant output – now account for roughly 75% of net global oil-demand growth, and are projected to become the largest driver of future oil demand. Plastic production has already doubled in the past two decades. Major oil companies are responding accordingly. Recent consolidation – including a $60bn merger creating one of the world’s largest plastics producers – reflects a deliberate pivot toward petrochemical assets as a long-term demand anchor.
，这一点在搜狗输入法下载中也有详细论述
转机出现了，下滚的牛被两棵树挡住，随即弹进了树旁的深坑，卡在坑里喘着粗气。几经周折，这头牛被拉出了坑，但它被重重摔过两次，早没了力气，没走几步路就四仰八叉地下滑，后面卧在沟底不动弹了。，这一点在Line官方版本下载中也有详细论述
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