http://us.battle.net/d3/en/forum/topic/20742996117#9
While stash space won't unlock for players automatically at the end of Season
if the requirements haven't been met, failing to acquire a stash tab reward
in a Season does not permanently prevent you from acquiring it in the future.
Seasons going forward (for the foreseeable future) will have a stash tab
reward; there is simply a cap to how many of them you can earn, that being 10
total tabs.
赛季结束后，没达到赛季旅程要求的玩家并不会自动解锁新的仓库页。但这不会导致你
之后永远不能再获得额外仓库页。接下来的赛季都会有额外仓库页奖励，上限是一共10
页。
For example, one player could earn a stash tab each in Seasons 5, 6, 7, and 8
(that being the fastest way to to hit the cap). Another might earn them in
Seasons 6, 7, 8, and 10.
举例来说，有玩家完成S5,S6,S7,S8（最快的方法）就获得所有的仓库页；另一位玩家
则是完成S6,S7,S8,S10。
And yes, I know what day it is. No joking around here. ;)
对了，我知道今天是什么日子。但是我是认真的。 ;)
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