Bùyán'éryù
不言而喻
it is self-evident.
it goes without saying; be an understood thing; comprehend without being told;
不
bù
adv. no/not
言
yá
v. to say/explain
而
ér
conj. then
喻
yù
v. to comprehend
Example 1 :
Bùyán'éryù, nǔlìgōngzuò huì dàilái chénggōng.
不言而喻，努力工作 會 帶來 成功。
It's understood that hard work could bring success.
Example 2 :
Wūrǎnduìhuánjìngdeyǐngxiǎng shì bùyán'éryù de.
污染對環境的影響是不言而喻的。
It goes without saying that the pollution has great impact on environment.