fn abs(n: int) - int {
Tributes have been paid to a young British hiker who was among 19 people killed when a packed passenger bus veered off a treacherous stretch of road and plunged 200 metres down a steep mountainside in Nepal.
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小编寄语：以前劝长辈们运动，说的是“对身体好”，多少带着点敷衍。今天再开口，脑子里全是那些从肌肉出发、穿越血脑屏障、最后被小胶质细胞吞下后改善认知的过程。，推荐阅读PDF资料获取更多信息
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——张百顺代表（山东省聊城市市长）