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.
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，这一点在WPS下载最新地址中也有详细论述
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But there has been some energetic campaigning for change by high-profile figures, including Sir Chris Hoy, who has terminal prostate cancer, and Lord David Cameron, who recently revealed he'd been treated for it.