obligation是可数的么?

OBLIGATION可数名词，也是不可数名词。

N-VAR 义务;责任If you have an obligation to do something, it is your duty to do that thing.

When teachers assign homework, students usually feel an obligation to do it...

老师布置作业时，学生通常认为完成作业是一种义务。

Ministers are under no obligation to follow the committee's recommendations.

部长不必非得听从委员会的建议。

appreciation啥意思？

意思：n. 欣赏；感激；鉴识；评价；增值

读音：英 [əˌpriːʃi'eɪʃn]；美 [əˌpriːʃi'eɪʃn] 　

复数： appreciations

用法：Appreciation of sth

动词：appreciate的基本意思是“高度评价某事物”，可表示对某事物理解深刻而能鉴赏或欣赏其价值，特别是美学价值，有时还可表示非常喜欢、非常感激的意思。引申还可表示“增值”。

理解；体谅；同情

I had no appreciation of the problems they faced.

我没有体谅到他们所面临的困难。

词汇搭配：

official appreciation 法定升值

appreciation of capital 资本的增值

reserve for appreciation 涨价准备

terrain appreciation 地形判断

Appreciation的近义词：

obligation

读音：英 [ˌɒblɪ'ɡeɪʃn]：美 [ˌɑːblɪ'ɡeɪʃn] 　 　

意思：n. 义务；责任

词意辨析：

obligation, duty

这两个词都指“义务”, duty多指“永远的义务”，如duty to one's country；obligation指临时性或一次性的义务，如obligation to wipe the car。

obligation的意思

obligation n.

1. [C] law, moral pressure, promise, etc that forces one to do sth （法律、 道义、 承诺等的）义务, 职责, 责任:

the obligations of conscience 良心上的责任

the obligations imposed by parenthood 为人父母者的义务

repay/fulfil an obligation, eg by returning hospitality that one has received 报恩[尽义务]（如还人情）.

2. [C, U] being forced or required to do sth （被迫或被要求做某事的）责任, 义务:

We attended the party more out of a sense of obligation than anything else. 我们参加那个聚会是迫於人情, 而并无别的原因.

3. (idm 习语) be under an/no obligation (to **/to do sth)

(not) be compelled by law, etc; (not) have a moral duty （没）有义务; （没）有道义责任:

You're under no obligation to pay for goods which you did not order. 没有订购的货物就无须付款.

She's under an obligation to him because he lent her money. 因为他把钱借给她了, 所以她有偿还他的义务.

4. place/put ** under an/no obli`gation (to **/to do sth)

(not) compel ** by law, etc (to do sth); (not) make ** indebted or grateful (to **) （不）使某人有义务（做某事物）; （不）使某人欠（某人的）人情或受（某人的）恩惠:

Damaging the goods puts you under an obligation to buy them. 你损坏了这些商品, 你就得都买下来.

His kindness places us under an obligation to him. 他待我们很好, 我们觉得欠着他一份人情.