You can use this word around your friends, but not in formal situations or with strangers.
一般用在很随便的场合，朋友之间。
Informal expressions like this can be used occasionally in formal situations, like the presentation example above, to make you sound relaxed, friendly and confident.
像这样的非正式短语informal expressions有时候也可以用在正式场合，如上例演讲中，令人感觉轻松，随意，也更自信。
The formal title or family name is usually only used in formal situations, when meeting someone for the first time, or when speaking to someone like a professor, medical doctor, politician or VIP.
姓只用在正式的场合，例如第一次晤面时，跟专家，医生，政客或贵宾的交谈的时辰。
In addition to formal situations, everyday persuasions include when to meet, whether to extend a deadline, and even such common things as where to have lunch or which movie to see.
除了正式情形下的说服，日常的说服包括何时减免，是否延长最后期限，甚至宝库奥去哪里吃饭和看哪部电影这样的小事。
There are lots of ways of greeting in English which can be used in both formal and informal situations, eg: How are you doing?
在英语中有很多问候的方式可以用在正式和非正式的场合里。
In many situations, particularly, less formal ones, this is sufficient.
在很多种情况下，特别是在那些不是很规范的条件下，该工具已经足够满足您的需求了。
In business situations, use formal titles unless the people you meet tell you otherwise.
在商业场合，除非对方告诉你不需要用敬语，否则就得用正式称呼。
Slang, or colloquial language-to use the formal term-is not appropriate in academic writing and many professional communication situations.
俚语，或是口语-用在正式的场合下-出现在学术写作和许多专业沟通时却是很不合时宜的。
Such books give suggestions for behaviour in very formal situations and do not help much with normal life.
这些书籍提示人们在十分正式的场合应该怎样做才符合礼仪，对普通生活行为没有太大的帮助。
But beware: the formal black colour can feel arrogant or overdressed in many situations.
但注意了：在很多场合，黑色会给人一种傲慢嚣张或过度装扮的感觉。
In some situations, such as Internet sales, a formal review is impractical for each order.
在某些情况中，如网上销售对每一个订单进行正式的评审，可能是不实际的。
We then construct a formal context called an agreement context designed to show that which is in common between the situations.
随后我们创建了一个名为“一致背景”的形式背景来表现不同情境间的相似性。
These greetings can be used in both formal and informal situations and are simply a friendly and common way to greet both friends and people you meet for the first time.
这些问候语既可以用在正式的场合中，也可以用在非正式的场合中。
Butt beware: the formal black colour can feel arrogant or overdressed in many situations.
但注意了：在很多场合，黑色会给人一种傲慢嚣张或过度装扮的感觉。
Jackie: So far, we've looked over some of those situations where you might use very formal language in greetings, such as 'sir' or 'madam'.
到目前为止，我们知道了在什么样的场合下使用‘sir’或者是‘madam’来问候别人。
It can be used in both formal and informal situations.
它可以用于正式和非正式两种场合。
It can be used in both formal and informal situations.
它可以用于正式和非正式两种场合。
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