知识拓展：constant adj.连续发生的；不断的；重复的；

　　4. previous adj.先前的；以往的；（时间上）稍前的

　　e.g. No previous experience is necessary for this job. 这一工作无需相关的经验。

　　I couldn't believe it when I heard the news. I had only seen him the previous day.听到这个消息时，我不敢相信；我就在前一天还见到过他。

　　知识拓展：previously adv. 先前的；早先

　　e.g. The building had previously been used as a hotel. 这座楼房早先曾用作旅馆。

　　5. bend v.（bent bent）弯曲；使弯曲；弯腰；弯身；常用搭配有: bend one's mind/efforts to sth. 致力于某事；bend sb.to sth. 迫使；说服 bend the truth 歪曲事实

　　e.g. It's hard to bend an iron bar. 把铁棒弄弯很不容易。

　　She bent her head and kissed her daughter. 她低下头吻了她的女儿。

　　6. press v. 压；按；推；挤；坚持；敦促 n. 报章杂志，新闻工作者，新闻界

　　e.g. She pressed a handkerchief to his nose. 她用手绢捂住鼻子。

　　She pressed down hard on the gas pedal. 她用力踩下油门踏板。

　　He is still pressing her claim for compensation. 他仍坚持索赔。

The press was/were not allowed to attend the trial. 庭审谢绝新闻采访。