三足鼎立

yí dòng tōng xìn háng yè zì xíng chéng sān zú dǐng lì zhī shì yǐ lái huà wù lèi shōu rù yǐ jīng dà fú xià jiàng

移动通信行业自形成三足鼎立之势以来，话务类收入已经大幅下降。

Since the mobile communication industry has formed the trend of tripartite confrontation, the revenue of traffic has decreased significantly.