in 、at 、by 、with 、at 、over 、of
大时间/大地点
in
树上长的苹果用in。人在树上用on，坐公交也用on
during、 for、 from 、to、 since、 as
A government of the people, by the people, for the people.三个介词短语做名词的后置定语
民有，民治，民享
for: 以...为交换，以...为代价
get something for nothing 不劳而获
I will give my watch for your camera.换你的相机用我的手表
sacrifice life for love牺牲生命换取爱
He paid 50$ for that picture.
get something for free什么都不要去换取
up 把动作做到极致
• use up用尽• eat up吃干净
• sweep up 扫干净• line up排齐了
• stack up 摞整齐• chew up 嚼碎• cut up切碎
China's innovation is having a great boom at（不能改成with） an unprecedented rate. 中国的创新正以前所未有的速度蓬勃发展。
自从1978年启动改革以来，中国已从计划经济 转为以市场为基础的经济。Since the very beginning of the reform in 1978, China has transformed from a planned economy to an economy based on the market and undergone a rapid development of economy and society.
过去，乘飞机出行对大多数中国人来说是难以想 象的。译 : In the past, traveling by plane was unimaginable for most Chinese people.
人们把现金作为礼物送给家人或亲密朋友时，通常放在红信封里。
译:Cash is often put in red envelopes and sent to family members or close friends as gifts.
A new study shows a large gender gap on关于 economic policy among the nation's professional economists, a divide similar to the gender divide found in the general public.
At the same time, however, young working women are less likely than men to aim at top management jobs; 34% say they're not interested in becoming a boss or top manager; only 24% of young men say the same. The gender gap on this question is even wider among working adults in their 30s and 40s.
