Some changes in DNA occur naturally and lead to no harmful effects;
有些DNA的变化是自然发生的不会产生有害影响；
It's important to protect your skin from the harmful effects of the sun.
保护你的皮肤免受日光的伤害很重要。
It's important to protect your skin from the harmful effects of the sun.
重要的是保护你的皮肤免受太阳光的毒害。
It's important to protect your skin from the harmful effects of the sun.
重要的是保护你的皮肤免受太阳光的毒害。
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