There is normally a time lag, with movements in oil markets taking about a fortnight to feed in to fuel prices.
Don't respond to an email until you've done some research.
。关于这个话题，新收录的资料提供了深入分析
2 ^ 8 = ERROR: unknown operator: ^Every call site decides how to handle the error. The match on calculate’s return value forces the caller to acknowledge both cases. Nothing fails silently.。新收录的资料对此有专业解读
// Public — importers can call this，详情可参考新收录的资料