如果没有实际内容，再大的声势也只能维持一时。

Rúguǒ méiyǒu shíjì nèiróng, zài dà de shēngshì yě zhǐ néng wéichí yìshí.

Without real substance, no matter how big the momentum is, it can only last for a while.

他们想通过一场声势浩大的活动来宣传新产品。

Tāmen xiǎng tōngguò yì chǎng shēngshì hàodà de huódòng lái xuānchuán xīn chǎnpǐn.

They want to promote the new product through a large-scale, high-profile event.