累月

kǎo gǔ xué jiā jīng nián lěi yuè pīn zǔ zhè fú jù dà de mǎ sài kè

考古学家经年累月拼组这幅巨大的马赛克。

Archaeologists have worked for years to piece together the huge mosaic.

rén lèi cháng nián lěi yuè de bǎo cún xìn jiàn

人类长年累月地保存信件。

People hold on to letters for years and years.