instalment
(US usu 美式英语通常作 installment), / ɪnˈstɔ:lmənt; ɪn`stɔlmənt/ n
1 any one of the separate but connected parts in which a story is presented over a period of time （一故事分段连载或连播等的）一集
a story that will appear in instalments 分段连载的故事
Don't miss the next instalment! 下期续载, 切勿错过!
2 ~ (on sth) any one of the parts of a payment spread over a period of time （分期付款的）一期付款
pay for a house by monthly instalments 按月分期付款买房
keep up the instalments (ie maintain regular payments) on the house 为买该房按时分期付款.