up的用法及短語？

1-PHRASAL VERB （在參考書、列表等中）查檢（事實或信息） If you look up a fact or a piece of information, you find it out by looking in something such as a reference book or a list. 2-PHRASAL VERB 拜訪，探訪，看望（久未見面的人） If you look someone up, you visit them after not having seen them for a long time. 3-PHRASAL VERB 改善；好轉 If a situation is looking up, it is improving.