take up 表示从事某种行业,职业
carry on 指：1.从事；经营；进行；继续：例句:Isabella's father carried on a trade in silks.
伊莎贝拉的父亲经营丝绸业.
2.(尤指迎着困难)进行下去,继续进行,坚持下去：例句:They will carry on their negotiations next week.
他们将于下周继续进行谈判.