Correct

对牛弹琴

/ duì niú tán qín /
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/对牛弹琴-Chinese-idioms-Cchatty-ef056738-015e-4b6a-8988-d6b942aacc63-1612776960.jpg

Collocation

1
完全是对牛弹琴
2
真是对牛弹琴
3
简直是对牛弹琴
4
何必对牛弹琴

Definition

对牛弹琴

Literally means:

play the lute to an ox

Actually means:

address the wrong audience; cast pearls before swine

It figuratively means reasoning with a person who is unreasonable, or someone who is slow in understanding. It connotes a sarcastic tone, implying that all one's efforts to make a stupid person understand something are futile. Derogatory.

比喻对不懂道理的人讲道理,或对领会能力不高的人说事。含有白费口舌,以及讽刺对方愚蠢的意味。具有贬义色彩。

Example

Used as predicate or object. (作谓语、宾语)
1
Zhèxiē
这些
hēixīn
黑心
lǎobǎn
老板
chúle
除了
zhuànqián
赚钱
shénme
什么
dǒng
  
,
duì
men
他们
jiǎng
wénmíng
文明
shēngchǎn
生产
zhīlèi
之类
de
shìqing
事情
  
,
jiùshì
就是
duìniútánqín
对牛弹琴
ma
  
?

These black-hearted bosses in addition to making money do not understand anything, you tell them civilized production and other things, is not to play the piano to cattle?

2
gēn
jiǎng
le
xiǎoshí
小时
le
  
,
zěnme
怎么
hái
míngbái
明白
de
si
意思
  
,
jiǎnzhí
简直
shì
zài
duìniútánqín
对牛弹琴
  

I've been telling you for an hour, why don't you understand what I mean, it's just playing the piano on a cow.

3
Yǒuxiē
有些
rén
lián
yīn
音乐
dǒng
  
,
gěi
men
他们
yǎnzòu
演奏
jiāoxiǎng
交响曲
  
,
wánquán
完全
shì
duìniútánqín
对牛弹琴
  
,
làngfèi
浪费
shíjiān
时间
  

Some people don't even understand the music, you play symphonies for them, it's all about playing the piano, it's a waste of time.

Related

对牛弹琴