// 从后向前扫描，大于key的元素后移
Digest: sha256:5638b6581830be13c9ae418c5d1587f36c7f99b3860326fa7b163bef70236438
，这一点在搜狗输入法2026中也有详细论述
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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.