下下月怎么表述

下下个月的书面语是 the month after next。例如：

1. 我们计划在下下个月去旅行。[We plan to go on a trip the month after next.]

2. 工资通常在下下个月的1至7号发放。[The salary is usually paid between the 1st and 7th of the month after next.]