小强永不分离小双生生世世
[xiăo qiáng yŏng bù fēn lí xiăo shuāng shēng shēng shì shì]
This appears to express a promise of eternal companionship or loyalty. Referring to two lovers (nicknamed as small strong ones) being inseparable for lives after lives, which is an affectionate romantic way to declare undying loyalty.