4-3-1 主要产品特性及其组合特色 一、DRAM DRAM有几个特性值得讨论：第一，产品替换周期(Replacement Cycle)长， 一但替换周期延长(需求不振)，晶圆厂就需要更多时间做调整。
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Eye wall Replacement Cycle 风眼及风眼墙置换循环
eyewall replacement cycle 置换过程 ; 眼墙置换
Filter Replacement Cycle 滤蕊更换周期
hormone-replacement cycle 激素替代周期
machine replacement cycle 换机周期
replacement and cycle model 更替循环模型
The action stops, however, when a replacement cycle is completed.
但是当替换过程完成后，这一上升就停止了。
Another is the end of the format-replacement cycle: once you have a DVD of “Casablanca” you don't need another one—and you probably won't buy a high-definition Blu-ray disc, either.
盗版是罪魁祸首之一，另一个原因则是美国人不再购买一张影碟来代替之前的一张：一旦有了一张《卡萨布兰卡》的DVD，就不需要再买一张了——也许也不会再买一张高清蓝光版本的。
Businesses had deferred purchases of servers during the economic down times to save costs, extending the replacement cycle for products that tend to have a working lifespan of about five years.
在经济低迷时期，企业推迟购买服务器以节省成本，延长了产品的更换周期。服务器的使用寿命通常为5年左右。
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