xiāng fǎn
相反相成
xiāng fǎn xiāng chéng
opposites complement each other
两个人走的方向相反。
liǎng gè rén zǒu de fāng xiàng xiāng fǎn.
The two people are walking in opposite directions.
困难不但没有把他吓倒，相反，更激起了他战胜困难的决心。
kùn nán bù dàn méi yǒu bǎ tā xià dǎo, xiāng fǎn, gèng jī qǐ le tā zhàn shèng kùn nán de jué xīn.
Not only did the difficulties not intimidate him, on the contrary, they further aroused his determination to overcome them.