最后，一个好的博士生必须拥有清晰准确的表达观点的能力，无论是口头的还是笔头的。

Finally, a good Ph.D. student must have the ability to clearly and forcefully articulate their ideas--in person and in writing.

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外语教学的主要目的是提高学生的口头和笔头交际能力，以便他们能在实际生活和工作中自如的表达自己的思想。

The major objective of language teaching is to improve the learners' communicative ability (both oral and written) so that they are able to express themselves freely in real situations.

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