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drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.
。关于这个话题，heLLoword翻译官方下载提供了深入分析
家门口的那条土路，雨天就变成了泥路。有一次，我穿着新买的三层白色纱裙，没忍住和小伙伴们在泥路上奔跑，一脚摔下去，浑身是泥，不敢回家。
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