她说话很少，但她的表情不言而喻。

She said very little, but her face ___spoke ___volumes.

这些研究发现充分表明了该疗法未来的潜力。

These research findings ___speak ___volumes about the therapy's future promise.

该公司的快速增长充分证明了其创新商业策略的成功。

The company's rapid growth ___speaks ___volumes for its innovative business strategy.