单击Next(只有当恰当地指定了要导入的源和导入的模型的目的地时，Next按钮才有效。)
Click Next. (the Next button will be enabled only when the source to be imported and the destination of the imported model are specified properly.)
这些推荐信要保证密封才有效，很明显，我那多事的老妈已经打开过了。
They need to be submitted sealed and of course my nosy mom decided to open them.
给你这报价。但这个价格要立即接受才有效。
Here you are. But the offer is subject to immediate acceptance.
应用推荐