Extant questions的用法和樣例：
例句
- The application of probiotic bacteria is one of extremely effective ways to solve the extant questions in aquiculture.
益生菌的應用是對水產養殖業現存問題十分有效的解決途徑之一。 - Using the Case based reasoning technology during the course of design, people can use experiences to solve current questions.
在設計時能運用基於實例的推理方法，從以往的設計實例中得出與現在問題最相似的實例，用以往的設計經驗來解決現存問題。
