Over time, the protein in the eggshell breaks down into its constituent amino acids.时间久了，蛋壳中的蛋白质就会分解为其构成成分氨基酸。As time went on, her visits became more and more infrequent.时间久了，她探访得越来越少了。Elmer seems pretty alert, but if you spend much time with him he starts to repeat himself.埃尔默看上去很机敏，不过你要是和他一起时间久了，他就开始说话重复了。