Many students have difficulty in delivering a speech in public, but they can overcome it through training.
很多学生觉得当众发表演讲很困难，但通过训练他们可以克服这一问题。
2
No matter how experienced a speaker you are and how well you have prepared your speech you will have difficulty making a speech at such a noisy reception.
无论你是多么富有经验的演说家，无论你做了多少充分的准备你都很难在这样嘈杂的招待会上发表演讲。
3
For the difficulty of stressful speech collection, although tested and trained in the same conditions, speech recognizer performs imperfect with sparse data.