较大的替换项目风险很大，开销也很大，只有现有系统不再能满足业务需求时才能进行。
Major replacement projects are risky, expensive, and warranted only when the existing systems can no longer satisfy business needs.
拉脱维亚强烈支持其四国的替换项目(即Visaginas新核电厂，以它替换原先的Ignalina)，但波兰态度冷淡，爱沙尼亚也正在考虑如果合建的核电厂失败，它将自行建造一座小型核电站。
The four-country replacement project has strong Latvian support, but Poland is lukewarm and Estonia is considering a small nuclear-power plant of its own if the joint one falls through.
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