俺幫你看了LENOVO的DATASHEET,看來這台機器只有一個SO-DIMM SOCKET,如果你要升級記憶體,就必須把舊的那條拔起來裝8GB DDR4。https://psref.lenovo.com/syspool/TempFile/cache/ea4916cc-79ca-4ed0-8b59-8a2a78e1b1b1/ideapad_S145-14IWL_single_model_202005131109.pdf