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English Answer:
The slogan for M&M's has evolved over the years, but one of the most iconic and long-standing slogans is "Melts in your mouth, not in your hands." This phrase was introduced in the 1950s and has been a key part of M&M's branding strategy, emphasizing the candy's unique property of having a hard shell that protects the chocolate inside from melting quickly.

Chinese Translation:
M&M's 的口号随着时间的推移已经演变，但其中最经典且长期使用的口号之一是 "只溶在口，不溶在手"。这个短语是在20世纪50年代推出的，一直是M&M's品牌战略的关键部分，强调了这种糖果的独特属性：拥有一个坚硬的外壳，可以保护里面的巧克力不会迅速融化。

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