公差是零件允许的变动量或给定尺寸允许的总变动。
Tolerance is the amount of variation permitted in the part or the total variation allowed in a given dimension.
更准确地说，是用户想让pin指向俱乐部会所或给定球场的第一个发球台。
To be precise, let's say the user wants the pin to point to the clubhouse or the first tee of a given course.
从队列中删除下一个引用对象，阻塞直到有一个可用或给定超时期满。
Removes the next reference object in this queue, blocking until either one becomes available or the given timeout period expires.
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