文化的有些方面在正式场合学习，如学校，而其他方面都在日常生活的过程中学会了非正式的。
Some aspects of culture are learned in a formal setting, such as a school, while other aspects are learned informally in the process of day-to-day living.
如果你一定要学会起草给人印象深刻的商务信函，非正式的、包含曰常俚语的对话不能帮你实现目标。
If you must learn to write effective business letters, informal conversation with current slang will not help you achieve your goal.
学会清晰地写好，使人们能够阅读；二、学会做适度正式的讲演；三、也要学会做非正式的讲演。
You have to learn to write clearly and well so that people will read it, you must learn to give reasonably formal talks, and you also must learn to give informal talks.
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