Speak volumes for sb/sth

(idm.)

be strong evidence of sb/sth's merits, qualities, etc.

充分证明某人/某事物的优点，品质等

e.g. These facts speak volumes for her honesty.

这些事实都有力地证明了她为人诚实。

e.g. The chairman seldom talked much at these meetings, but his gestures and noise spoke volumes.

主席很少在这些会议上谈话，但他的手势和声音却意味深长。

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