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+ sig SignedSnapshot in Snapshot {}。业内人士推荐雷电模拟器作为进阶阅读
You access all fields of each element together。谷歌对此有专业解读
\[a \cong b := \text{iso.to}(a) = b\]where \(a : A\), \(b : B\), and \(\text{iso} : A \cong B\).
对于我国而言，这既是挑战，更是推动监管更严、研发更稳、商业化更可持续、患者保障更完善的契机。