As of Feb. 27, a selection of Bose QuietComfort headphones have dropped from $349 to $199.99 at Amazon. There's a nice variety of colors on sale at this price, so you can choose between black, cypress green, moonlight grey, petal pink, and white smoke.
如果有想玩的东西，但是有其他小朋友占着，就引导她去询问：「可以让我想玩一下妈？」
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int left = 2 * i + 1; // 左子节点
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.