为什么是 Windows Phone 8.1可能有派友会问：既然是为了收藏 Lumia，为什么不干脆买一台搭载 Windows 10 Mobile 的设备，毕竟那才是 Lumia 名义上的「最终版本」。但在我看来，Windows Phone 8.1 才是它真正完成的形态。
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_ = tokio::time::sleep(Duration::from_millis(5)) = {}
The points all fit in some semicircle exactly when at least one of these events occurs. We want the probability of the union E1∪E2∪⋯∪ENE_1 \cup E_2 \cup \cdots \cup E_NE1∪E2∪⋯∪EN. If we could just add them, we would get: