to visit someone informally or without prior notice
非正式地或在没有事先通知的情况下拜访某人 (fēi zhèngshì de huò zài méiyǒu shìxiān tōngzhī de qíngkuàng xià bàifǎng mǒurén)
"Feel free to drop by anytime for a cup of tea."
"随时过来喝一杯茶，随时欢迎。" (Suíshí guòlái hē yībēi chá, suíshí huānyíng.)
to review something again for confirmation
to wish very strongly for something that cannot happen or is...
to unite and cooperate for a common cause
to dance while music is playing
to gradually remove limitations on trade
to connect or cooperate with another group or country
