Gas prices soar and oil jumps as Iran war pushes down global stock markets
（3）行情持续性与估值判断：化工属于高弹性行业，景气周期来临时弹性远高于大盘，且当前景气向上叠加流动性充裕，长期配置需求旺盛，作为高赔率资产，在风偏高的市场环境下提前兑现部分预期属于正常情况。过往化工行业每轮景气周期基本为两年左右，但判断本轮景气周期或更长，目前尚未到讨论行情高点或卖点的阶段，需待主要产品价格涨至历史高位、盈利处于高水平时再分析是否进入周期中后期，由于周期品价格高度难以准确预测，顺势而为是较为合理的选择。
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第一百六十四条 海上拖航合同，是指承拖方用拖轮将被拖物经海路从一地拖至另一地，而由被拖方支付拖航费的合同。
Collections of Documents on the other hand, offer a much more relaxed approach. Collections are just namespaces where we insert documents. Documents are objects of any schema and format; but in practice, it almost always is JSON. There are no enforced types, no constraints, no guarded references between documents in different collections. In the same collection, we might have documents of completely different schema - flexibility and openness to any data and column types rules here. In tables, rows have columns of simple, scalar types (mostly) - numbers, ids, strings, dates, timestamps and so on. In collections, documents have fields comprising both simple and composite types like arrays and other documents, nested inside. Same field in different documents, but still of the same collection, might have different types as well - almost anything is allowed here.
if (deadline != 0L && ...) { // 超时