Operating on the boundaries of that 6-foot range may only pickup a weaker signal, and be more susceptible to objects that are physically blocking the transmitter's signal.
在6英尺的边界操作，可能只会接受到一点微弱的信号，而且更易被物理障碍干扰。
Some of these objects are useful in blocking a thread until some event occurs.
这些东西很有用在阻止一个线程的执行直到某些事件发生。
Some of these objects are useful in blocking a thread until some event occurs.
这些东西很有用在阻止一个线程的执行直到某些事件发生。
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