游泳池里甚至自来水里氯气浓度不一定比那个低，至少我从来没从胡萝卜里尝到氯气味道

The white discolouration that sometimes forms on carrots is NOT chlorine residue. If it was chlorine, you would be able to smell and taste it.

The white discolouration is a result of moisture loss from the surface of the carrots. This will naturally occur on the surface of any peeled carrot as it dries.You can test it yourself.