an official mark made in a passport which allows you to enter or leave a particular country

sth. that you must do, or sth. you need

requirement

n. 需要；要求

enterprise

n. 事业；事业心

visa

n. 签证

eagerness to do sth. new and clever, despite any risks

revision

n. 复查；修正；复习

change that is made to sth., or the process of doing this; study of work you have done, in order to prepare for an examination