The AHA's chart still USES the 220 minus age formula, but has a wider zone of 50 to 85 percent of your Max heart rate.
该协会的表中仍然沿用220减去年龄的算法，但是讲区间扩大到了最高心率的50%到85%。
Max, who is greying, has a veterinary birth certificate to prove his age and is awaiting official confirmation from Guinness World Records。
马克斯毛发呈灰色，他的动物出生证明足以证明它的年龄。 目前马克斯正等待吉尼斯世界纪录的官方确认。
However, if max-age (or corollary s-maxmag for public caches) is set, its value overrules Expires.
但是，如果设置了max -age(或者对于公共缓存来说必然使用的s -maxmag)，则它的值将撤销Expires。
Add Expires and max-age directive of Cache-Control HTTP Header in server responses.
在HTTP头信息里加入缓存控制过期和最大存活时间标记。
Max, who is greying, has a veterinary birth certificate to prove his age and is awaiting official confirmation from Guinness World Records.
马克斯毛发呈灰色，他的动物出生证明足以证明它的年龄。目前马克斯正等待吉尼斯世界纪录的官方确认。
If your content changes often, but not on every page hit, consider setting a Cache-Control: max-age header; most users access pages again in a relatively short period of time.
如果你的内容经常改变，但是不是每次页面请求都改变，考虑设置一个Cache - Control： max -age头信息；大部分用户会在短时间内多次访问同一页面。
Note: the cache-control max-age and s-maxage will override the Expires header.
注意：cache - control max -age和s - maxage将覆盖Expires头部。
Note: the cache-control max-age and s-maxage will override the Expires header.
注意：cache - control max -age和s - maxage将覆盖Expires头部。
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