路灯再亮终是黑夜
[lù dēng zài liàng zhōng shì hēi yè]
'No Matter How Bright the Street Light Shines, It Remains Night' means even if streetlights bring some light to the night, it can't change the fact that it's still dark. It implies the feeling that even if you try your best, it may not completely transform things or overcome all difficulties.