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.
续航表现同样是本次升级重点。As2 在空载状态下可连续运行超过 4 小时；在 15 kg 负载下仍可行走超过 13km。其极限速度可达 5m/s，并具备 IP54 防护等级，可在雨水、潮湿等复杂环境中工作。
，这一点在搜狗输入法下载中也有详细论述
"You just feel like you're the most free person in the world. You've got this tight knit group of people, and you all really care about each other - you become like a little family. Everyone looks after each other."
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