She's so soft-hearted that she can't resist taking stray dogs home.

soft-hearted 是由形容词 soft（柔软的）和名词 heart（心）加上后缀 -ed 组成的复合形容词。soft 在这里比喻为"温和的、善良的"，heart 指"内心、心肠"。 soft-hearted 形容一个人"心肠软的、容易同情别人的"，指容易被感动或对他人苦难特别敏感的性格特点。