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单词辨析：
普通用词，指与“前面”相对的背面、后面，如人体、衣服等的背部，或建筑物等的后面、后部。
a T-shirt with a picture of a bear on the back
后背是熊的图案的T恤衫
A small garden sits at the back of the house.
房子的后面有个小花园。
指物体、车辆、建筑物或位置的后面，常用于 at/to the rear (of sth)结构。
At the rear of the house is a garden.
房子的后面是个花园。
The building overlooks the river to the rear.
这栋楼房后面临河。
含义广泛，多指在道义或物质上支持某人或某项事业。
I support the campaign because I agree with its aims.
我支持这一运动，因为我赞同它的目标。
He had to support his family with his meagre income.
他只能靠微薄的收入来养家。
We will spare no pains to support you.
我们将全力支持你们。
尤指以金钱、影响力等对某人或某事物给予支持。
The government backed the test with money.
政府提供资金支持这项试验。
Some suspected that the rebellion was backed by the US government.
有人怀疑叛乱有美国政府在背后支持。
Her claims are not backed by any scientific evidence.
她的说法没有任何科学依据。
较正式用词，指在道义、行动等方面给予某人或某事物以支持。
We have a duty to uphold the law.
维护法律是我们的责任。
The IWC voted to uphold the ban on commercial whaling.
国际捕鲸委员会投票支持禁止商业捕鲸。
The President swore to uphold the constitution.
总统宣誓维护宪法。
相关例句：
There was a neatly folded pink sweater on the back of the chair.
椅子的靠背上搭着一件叠得整整齐齐的粉色毛衫。
Nick looked back over his shoulder and then stopped, frowning
尼克回头看了看，又皱着眉头停了下来。
Meanwhile, back in London, Palace Pictures was collapsing
与此同时，伦敦的皇宫影业公司也正在分崩离析。
She handed the knife back
她递还刀子。
She lay back and stared at the ceiling
她躺下盯着天花板。
They wrote back to me and they told me that I didn't have to do it
他们回信告诉我说不必那么做。