其一，原料端政策管控壁垒。生产PVDF的关键单体R142b，受《蒙特利尔议定书》及国内产业政策管控，仅10余家企业拥有合法生产配额，配额稀缺导致原料供给受限，新进入者无法获得核心生产原料，丧失入场基础。
foldl' forces the accumulator at each step, but only to weak head normal form. For an attrset, WHNF means "yes, this is an attrset." The values inside (i, total) stay as thunks. After 100,000 steps, each field is a chain of 100,000 deferred additions, the same pathology as the naive trampoline's non-key fields. On this machine, the C++ stack gives out around 65,000 deep. The trampoline with deepSeq handles the same workload without issue because it forces the entire state, not just its outer shape:。关于这个话题，易歪歪提供了深入分析
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Отмена американского выступления Ивана Урганта20:58