就像你看到的，事实上你已经有过做即席演讲的经验了。
As you can see, you already have experience giving impromptu speeches.
这是其它一些关键技巧，根据我自己的演讲经验以及从其他优秀演讲者身上发现的总结的。
Here are some others key tips based on my own speaking experience and what I've noticed in other good speakers.
经验能够帮助树立信心，这是演讲取得成效的关键之所在。
Experience builds confidence, which is the key to effective speaking.
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