求翻译：虽然虚拟装配技术具有广阔的应用前景，国内外研究也取得了很大的进展，但是虚拟装配技术的各种理论和方法还不成熟，在技术方面主要存在以下问题：是什么意思？

Although the virtual assembly technology has broad application prospects, domestic and international research has also made great progress, but the various theories and methods of virtual assembly technology is not mature, in the technical aspects of the following problems:

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Although the hypothesized assembly technology has the broad application prospect, the domestic and foreign research have also made the very big progress, but hypothesized assembly technology each kind of theory and the method are not mature, mainly has following problem in the technical aspect:

Although virtual Assembly technology has broad application prospects, research has also made great progress at home and abroad, but various theories and methods of virtual Assembly technology is not yet mature, primarily in technology has the following problem:

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