困难difficulty; financially difficult
密码password; cipher/secret code
开心happy; amuse oneself at one's expense
来不及find no time to do something
来得及have enough time to do something
留remain; study abroad/overseas
看法view; unfavourable/critical view of somebody
经验experience; knowledge or skill obtained through practice
老虎tiger; energy-consuming machine
解释explain; explain implications, reasons, causes, etc.
距离be at a distance from; distance or space between
零钱small change; pocket/spending money