（二）乏燃料，是指在反应堆堆芯内受过辐照并从堆芯永久卸出的核燃料。
block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.
，推荐阅读夫子获取更多信息
Deferred loading of images (LazyLoad)
This year there were more than 30,000 applicants for 10,000 jobs at this stage, although some will have been doctors from abroad.