?T is a built-in type with two variants: some(value) wrapping a value of type T, and none representing absence. Use it when a value might not exist — not because something went wrong, but because there may simply be nothing there:
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。关于这个话题,新收录的资料提供了深入分析
might fall through the cracks.。关于这个话题,新收录的资料提供了深入分析
Смартфоны Samsung оказались забиты «мусором»14:48
拍卖所得价款,在扣除保管和拍卖过程中的全部费用后,依照本法规定支付救助款项;剩余的金额,退还被救助方;无法退还、自拍卖之日起满一年又无人认领的,归国家所有;不足的金额,救助方有权向被救助方追偿。