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Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.
，这一点在heLLoword翻译官方下载中也有详细论述
Eileen Collins made history as the first woman to pilot and command a Nasa spacecraft - but despite her remarkable achievements, not everyone will know her name.
It is the first time in the event's history that the ceremony will be held outside of London.