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昨天的句子中：
The Federal Reserve left interest rates unchanged.
leave 的过去时态：left
leave sth unchanged
leave 很难说是什么意思。
这里可以翻译为：使...保持不变=维持...不变；
当然你来看一下leave这个词，你就知道你还需要系统的学习：
make, render, give ,take, go等单词的用法了。
我们一个一个的盘，你们说好不好！
leave
leave / liːv/ verb(left, left/ left/ )
PLACE / PERSON地方；人
1.to go away from a person or a place
离开(某人或某处):
▪[V]
Come on, it's time we left.
快点,我们该走了。
The plane leaves for Dallas at 12.35.
飞机于 12:35 起飞前往达拉斯。
▪[VN]
I hate leaving home.
我讨厌离开家。
The plane leaves Heathrow at 12.35.
飞机于 12:35 在希思罗机场起飞。
HOME / JOB / SCHOOL家；工作；学校
2.to stop living at a place, belonging to a group, working for an employer, etc.
离开居住地点(或群体、工作单位等):
▪[V]
My secretary has threatened to leave.
我的秘书以辞职相要挟。
▪[VN]
Some children leave school at 16.
有些学生 16 岁就离校了。
WIFE / HUSBAND妻子；丈夫
3.[VN] ~ sb (for sb) to leave your wife, husband or partner permanently
遗弃；丢弃:
She's leaving him for another man.
她要抛弃他去跟另一个男人。
STH TO DO LATER以后要做的事
4.[VN] to not do sth or deal with sth immediately
不立刻做；不马上处理:
Leave the dishes—I'll do them later.
盘子先搁着吧,我等会儿再洗。
Why do you always leave everything until the last moment?
你怎么什么事都留到最后一刻才处理？
SB / STH IN CONDITION / PLACE处于某种状态；在某地方
5.to make or allow sb / sth to remain in a particular condition, place, etc.
使保留,让…处于(某种状态、某地等):
▪[VN-ADJ]
Leave the door open, please.
请把门开着吧。
The bomb blast left 25 people dead.
那颗炸弹炸死了 25 个人。
▪[VN -ing]
Don't leave her waiting outside in the rain.
别让她在外边雨里等着。
▪[VN to inf]
Leave the rice to cook for 20 minutes.
把米饭煮 20 分钟。
▪[also VN]
6.to make sth happen or remain as a result
使发生；造成,使留下为(某种结果):
▪[VN]
Red wine leaves a stain.
红葡萄酒会留下污渍。
She left me with the impression that she was unhappy with her job.
她给我的印象是她不满意自己的工作。
▪[VNN]
I'm afraid you leave me no choice.
恐怕你没给我留下选择的余地。
7.be left
[VN] to remain to be used, sold, etc.
留下备用(或销售等):
Is there any coffee left?
还有咖啡剩下吗？
How many tickets do you have left?
剩下的票你还有多少张？
(figurative)They are fighting to save what is left of their business.
他们在拚命抢救他们仅余的业务。
The only course of action left to me was to notify her employer.
我可能采取的唯一措施就是通知她的雇主。
8.[VN] ~ sth / sb (behind)