英语语法分析

I don't mean that you have to assume a parade-ground posture, but stand in a comfortable, natural way, rather than hunching over the lectern.

我不是说你必须摆出一副阅兵的姿势，而是要以一种舒适、自然的方式站立，而不是弯腰驼背地在讲台上。

How do I know that there is a lectern?

我怎么知道讲台是存在的？

Bush said at the lectern, "I always enjoy these events."

布什在讲台上时说：“我总喜欢这类活动。”