在一个基于Java Swing的应用程序中，如果需要创建一个可关闭、可调整大小、并带有标题栏的窗口，应该使用哪个组件作为顶层容器？

A translator is working on a document that contains both factual statements and subjective opinions. During the translation process, they must choose words that accurately convey both the literal meaning and the intended nuance of the original text. Which of the following strategies should the translator prioritize to ensure a faithful and effective translation?

Which of the following is the closest synonym for 'fluctuation' in the context of the stock market?

In formal writing, which expression is appropriate for hypothetical situations?

已知行列式D_n满足递推关系D_n = a·D_{n-1} - D_{n-2}，且D_1 = cosθ。当D_3 = 2cos3θ时，系数a的值为？