The process — from establishing a proof-of-concept prototype to realizing a fully functional solution — may take three to four months.

从建立验证概念的原型到实现一个功能完整的方案的过程大约需要三、四个月。

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But people are realizing more and more that this traditional solution can lead to health problems, such as HIV.

但人们目前日益认识到这种传统的解决办法可能导致健康问题，如艾滋病毒等。

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The third letter was born in the middle of the 20th century, when we started realizing that the solution to pollution was not dilution.

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