to  cast pearls before swine
<abbr style="text-decoration: underline;" title="cast / throw" > cast</abbr>
kast
kast
pearls
θrəʊ
threw
before
pɜ:lz
pēlz
swine
bɪfɔ:
bifaw
[cast|throw] {one's} pearls before swine

“ cast pearls before swine”的英语定义和含义

to cast pearls before swine
01

对牛弹琴, 好心白费

to do good things and waste valuable resources for ungrateful people 
to [cast|throw] pearls before swine definition and meaning
习语
例子
Helping him again would just be casting pearls before swine. 

再帮他就是对牛弹琴。

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