重點(diǎn)講解：
1. open up
開辟；打通；
eg. As rescue workers opened up roads today, it became apparent that some small towns were totally devastated.
今天救援人員打通了道路后，人們發(fā)現(xiàn)一些小鎮(zhèn)顯然已被徹底摧毀。
eg. The sales manager wants to open up new markets in the Far East.
銷售經(jīng)理想在遠(yuǎn)東開辟新市場。
2. have an impact on sth.
對(duì)……產(chǎn)生影響；作用；
eg. Technology has had an irreversible impact on society.
技術(shù)已對(duì)社會(huì)產(chǎn)生不可逆轉(zhuǎn)的影響。
eg. There's no question that the ads had a real impact on the public.
毫無疑問，這些廣告對(duì)公眾確實(shí)產(chǎn)生了影響。
3. from time to time
不時(shí)地；間或；偶爾；
eg. Her daughters visited him from time to time when he was ill.
他生病的時(shí)候她的女兒們時(shí)常去探望他。
eg. From time to time,she gave him an encouraging nod.
她不時(shí)對(duì)他點(diǎn)頭鼓勵(lì)。