乐观估计 meaning in English

optimistic estimate

There are several reasons for this optimism
有几个原因促使人们对核能保有这种乐观估计。
In such systems , they are likely to believe every browser might be a buyer later , so they give the same care to all of the customers without calculating whether the expected profit from a customer is greater than the cost of marketing to her or not
可如何根据客户对企业不同的贡献将客户分层，目前为止这仍然是个需要深入的问题。当企业制定推荐策略时，是应本着“所有的浏览者都可能成为潜在购买者”的乐观估计而对所有用户实施同样的客户关怀呢