眼泪再苦再咸有迩安慰微笑再美再甜不是迩旳
[yăn lèi zài kŭ zài xián yŏu ĕr ān wèi wēi xiào zài mĕi zài tián bù shì ĕr dì]
Tears can be very bitter, but they are comforted by your warmth; however, even the sweetest smile is meaningless if it's not from you. It expresses longing and the importance of a loved one.