1·They also contain nickel, which a lot of people are allergic to (sidenote: how crazy would it be if Thomas Jefferson was allergic to nickel?).
手机里还有使很多人过敏的镍(旁注：如果冠希哥对镍过敏那将是多狗血的一件事)。
2·As a sidenote, I use this trick frequently: if I'm not sure about my reaction to some event, I imagine someone describing the situation to me as if it happened to a stranger.
旁注，我经常用这个技巧：如果我不知道对某个事的反映，我会想象自己是一个在给自己描述仿佛发生在陌生人身上的事情。
3·A sidenote detection of the source code, to learn to understand marginalia have a good reference value.
说明：一个旁注检测的源代码，对学习理解旁注具有很好的参考价值。