subdivision

subdivision
/ˌsʌbdɪˈvɪʒn; ˌsʌbdə`vɪʒən/ n
1 [U] action or process of subdividing 进一步细分.
2 [C] thing produced by subdividing 进一步分成的部分
    a subdivision of a postal area 邮区属下的分区
    This division of the chapter has several subdivisions. 该章这一节里又分成几个小节.

牛津英汉双解词典