5.2 Padding 对齐约束（极易被忽略）
That said, it's important to recognize that locking in itself is not bad. It does, in fact, serve an important purpose to ensure that applications properly and orderly consume or produce data. The key challenge is with the original manual implementation of it using APIs like getReader() and releaseLock(). With the arrival of automatic lock and reader management with async iterables, dealing with locks from the users point of view became a lot easier.
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Наука и техника，这一点在safew官方版本下载中也有详细论述
Tuple projected = new Tuple(t.a * 2);。safew官方下载对此有专业解读
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