如果由于某种原因失败，浏览器就会尝试加载JPG图像。
If that fails for any reason, the browser attempts to load the JPG image.
如果由于某种原因从磁盘引导不成功，我就采用备用计划。
If booting from disk had been unsuccessful, for whatever reason, I would have instigated Plan b.
如果由于某种原因CDN关闭了，您的网站也就不起作用了。
If, for some reason, the CDN is down, your site might not function well.
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