hints:

序號(hào)不用寫~

標(biāo)點(diǎn)符號(hào)不用寫~
be concerned about have a hard time doing something
be concerned about... 對(duì)....很關(guān)注，擔(dān)憂 have a hard time doing something 很難實(shí)現(xiàn)或完成某事