于是，出现了三层(Tree-tier)的C／S结构。该结构由客户端、应用服务器端和DBMS服务器端三层构成，客户端只用于实现表示逻辑，而将业务逻辑交由应用服务器实现...
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tree-tier structure 三层结构
Improved Concentration Aura moved from the Protection tree to tier 4 in the Holy tree.
强化专注光环从防护树移动到神圣第四层；
It has also been moved one tier earlier in the tree and its spell effect has been made more transparent.
它被提前了一层并且其法术效果更容易辨别。
Scattershot has been moved from the Marksmanship Tree to Tier 3 of the Survival Tree.
驱散射击现在从射击系移动到生存系第3层。
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