概数的表达：几、多 "几" and "多": expressions of approximate numbers

“几”可以表示10以内的不定个数，后边要有量词。例如：
"几" can indicate an indefinite number less than 10, followed by a measure word. For example:

• 车上有几个人。
• 我想买几本书。
• 我们要不要买几个新的椅子？

“几”可以用在“十”之后，表示大于10小于20的数字，如：十几个人；也可以用在“十”之前，表示大于20小于100的数字，如：几十个人。
When "几" is used after "十", it indicates a number greater than 10 but less than 20, for example, "十几个人" (a dozen people or so); when used before "十", it indicates a number greater than 20 while less than 100, for example, "几十个人" (dozens of people).

“多”与数量词搭配使用，数词是10以下的数字时，“多”用在量词之后。例如：
"多" can be used together with numeral-measure word phrases. When the numeral is less than 10, "多" should be put behind the measure word. For example:

数词是10以上的整数时，“多”用在量词前，在这种情况下，“多”和“几”通用。例如：
When the numeral is an integer greater than 10, "多" is put before the measure word. In this case, "多" and "几" are interchangeable. For example:

疑问代词“几”用来询问数量的多少，一般用于询问10以下的数字。
The interrogative pronoun "几" is used to ask about a number, usually less than 10.