这牛重得实在费劲，走在前面的人抬着木桩，后面的人就得高举木桩，才能保持牛身平衡。接二连三有人踩滑摔趴在地上，被旁边的人拉起来后，大伙继续齐喊“一二走——一二走——一二走”，山沟里的回声都是铿锵有力的。
BYOB (bring your own buffer) reads were designed to let developers reuse memory buffers when reading from streams — an important optimization intended for high-throughput scenarios. The idea is sound: instead of allocating new buffers for each chunk, you provide your own buffer and the stream fills it.，这一点在谷歌浏览器【最新下载地址】中也有详细论述
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Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.
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