以上各词均指价值、价钱。
These words all refer to the amount of money that you have to pay for sth.
price
指商品或服务的价格、价钱
the amount of money that you have to pay for an item or service
例如：
house prices
房屋价格
How much are these? They don't have a price on them.
这些东西卖多少钱？它们都没有标价。
I can't afford it at that price.cost
这样的价格我付不起。
cost
指购买、制造某物或做某事所需的成本、费用、花费
the amount of money that you need in order to buy, make or do sth
例如：
A new computer system has been installed at a cost of £80 000.
新的计算机系统已安装，费用为8万英镑。
value
用金钱方式或用与其他商品交换方式进行衡量，得出的某物所值价钱
how much sth is worth in money or other goods for which it can be exchanged
例如：
The winner will receive a prize to the value of £1 000.
获胜者将得到价值为1 000英镑的奖品。
尤其在英国英语中，value亦含与其价格相比的值、划算程度
Especially in British English, value can also mean how much sth is worth compared with its price.
例如：
This restaurant is excellent value (= is worth the money it costs).
这家餐馆很合算。
expense
指所花费用、花钱的东西、开销
the money that you spend on sth; sth that makes you spend money
例如：
The garden was transformed at great expense.
花园改建花了一大笔费用。
Running a car is a big expense.
养一辆车开销很大。
worth
指人或物的价值
the financial value of sb/sth
例如：
He has a personal net worth of $10 million.
他有价值1千万元的个人净资产。
This painting is probably worth thousands of pounds.
这幅画可能价值数千英镑。
worth较常用以指某事物的实际作用或道德意义。
Worth is more often used to mean the practical or moral value of sth.
例如：
This book is definitely worth reading.
这本书确实值得一读。
It was a difficult journey, but it was worth it.
这次旅行很艰苦，但很值得。
用price、cost还是value？
price指商品或服务的要价
The price is what sb asks you to pay for an item or service.
例如：
正确：to ask/charge a high price 要价／收费高
错误：to ask/charge a high cost/value
cost指获取某物或达到某目的所需的费用
Obtaining or achieving sth may have a cost
例如：
the cost of moving house 搬家费用
value指别人愿意为某物付出的值
the value of sth is how much other people would be willing to pay for it
例如：
The house now has a market value of one million pounds.
这栋房子目前的市场价值为100万英镑。
