你以为我的心是不锈钢么
[nĭ yĭ wéi wŏ de xīn shì bù xiù gāng me]
This expression means asking whether one thinks the heart is indestructible like stainless steel. It's a rhetorical way to say the speaker's emotional vulnerability to pain and disappointment caused by others, highlighting sensitivity and the capability of being deeply affected by actions or words of others.