hints:

序號(hào)不用寫(xiě)~

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