change
单词辨析：
普通用词，可指任何变化，强调与原先的情况有明显的不同。
A witch changed the boy into a mouse.
女巫把那男孩变成了一只老鼠。
The economic situation has changed considerably.
经济形势已发生了相当大的变化。
The leaves on the trees change colour in the autumn.
树叶在秋天改变颜色。
常指轻微改变，强调在保持原状的情况下进行局部改变。
Your coat is too big. You must have it altered.
你的外衣太大了，得找人改一下。
The working condition must be altered to meet the new requirements.
工作环境必须改善，以适应新的要求。
指改变形式、用途、使用方式等，也指改变信仰、观点、态度等。
Please convert this money into RMB.
请把这钱兑换成人民币。
Her mother has converted to Catholicism.
她母亲已改信天主教。
指对某物作细小的改动以对其进行改进，使其更适用或更高效。
The plan must be modified if it is to be used.
这项计划要用就必须修改。
You'd better modify your tone.
你最好说得和缓些才是。
指在形式、外观、性质等方面彻底改变，即成为全新的东西。
The magician transformed the handkerchief into a bird.
魔术师把那条手帕变成了一只鸟。
Solar energy can be transformed into power.
太阳能可以转化为能量。
普通用词，指外形、颜色、气味、性质等方面发生变化。
Coal can be turned into heat.
煤可以转化成热。
He turned this novel into an English best-seller.
他把这本小说变成了英语畅销书。
指根据某一情况的变化而变化，也指更改某事物。
The prices of fish vary according to market conditions.
鱼的价格随着市场行情而变化。
Old people don't like to vary their habits.
老年人不喜欢改变他们的习惯。
指随时可以支付的钱币，而非支票、信用卡等。
She always has cash on her.
她身上总带着现金。
Shall I pay you in cash or check?
我付你现金还是支票？
We give 10 percent discount for cash.
现金付款的话，我们给予9折优惠。
指买东西找回的钱，或小面值零钱。
Here is the change, sir.
先生，这是找你的钱。
This ticket machine gives change.
这台自动售票机可以找零。
He had no small change to leave as a tip.
他没有零钱留下来付小费。
指用各种金属制成的钱币，如金币、银币、铜币等。
She paid him in coins.
她付给他硬币。
Bob likes to collect foreign coins.
鲍勃喜欢收集外国硬币。
指纸币，相当于 bank note。
There are five hundred pounds in notes on the desk.
桌上有共值500英镑的纸币若干张。
He gave me five fifty-dollar notes.
他给了我5张50美元面额的钞票。
相关例句：
The ambassador appealed for a change in US policy
大使呼吁美国在政策上作出改变。
Ben had merely changed his shirt
本仅仅换了件衬衫。
You can expect to pay the bank a fee of around 1% to 2% every time you change money
每次到银行换币都会要求付1%到2%的手续费。
If you want to change your doctor there are two ways of doing it.
你要是想换个医生，办法有两个。
1998 was an important year for everyone: a time of change.
1998年对所有人来说都是重要的一年：那是个变革的时期。
His doctor increased the dosage but did not change to a different medication
他的医生加大了剂量，不过没有换药。