只能隐藏自己才能偷偷爱你
[zhĭ néng yĭn zàng zì jĭ cái néng tōu tōu ài nĭ]
Means 'I can only love you secretly by hiding myself'. It expresses secretive love that the person keeps within themselves, unable or unwilling to openly show their affection for some reason, possibly due to fear, obstacles, etc.