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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，这一点在快连下载安装中也有详细论述
683 COUNTR TMPC PASS SDEL ; write descriptor to cache
她也认为，我对外公外婆不够热络。毕竟，我曾在无数个周末享受他们的照料，理应感恩。
Speaking of emoji, they’re fun and can convey your meaning as well as the most thoughtful turn of phrase, Wesson said. But don’t abuse them because they can be a “minefield.”